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2017 Additions / Changes
Sep 25: Took advantage of the HST Picture of the Week to add an entry for PGC 31961. Also updated the entry for NGC 7009, in preparation for a further update on Sep 27.
Sep 12: Took advantage of the HST Picture of the Week to update and complete the entry for NGC 5398, and began a long-overdue update of the page for NGC 5350 - 5399; but due to pressing real-world concerns, have yet to finish the page.
Sep 4: Took advantage of the HST Picture of the Week to update and complete the entry for NGC 5559. Also updated thumbnails and links for Arp 286 and 292.
Aug 29: To take advantage of a new HST image of NGC 5765, completely updated and finished its entry.
Aug 22: Since it was referenced in the discussion of IC 511, did a complete update for IC 520, and as a result of a search for images of IC 520, also updated IC 5201.
Aug 21 - 22: While taking care of the changes noted in the previous update, I discovered that all four objects observed by Lewis Swift on Sep 1, 1888 had the same 10 minute of time error in their recorded positions. This required updating IC 511, PGC 24397 and NGC 2646. Also did a thorough update of the entries for the pair of interacting galaxies known as NGC 5730 and NGC 5731.
Aug 20 - 21: Thanks to a suggestion by Steve Gottlieb, Harold Corwin has shown that three objects observed by Lewis Swift on Sep 1, 1888 had a 10 minute of time error in their recorded right ascensions, so after nearly 140 years of being "lost" or (even worse) misidentified, they have now been correctly identified. Complete updates for all three objects (IC 895, 1028 and 1045) and for the objects they were previously misidentified as have now been posted to reflect those corrections.
Aug 17: Am sick, so (sniffle) will miss seeing the total eclipse on Aug 21, and make little if any progress on this website for a few days. However, I have taken advantage of a beautifully processed HST image of IC 3568 to completely update its entry (though, despite the note for Aug 11, only on one of the 50+ entry pages at the moment).
Aug 11: Since most catalogs of NGC/IC objects have individual pages for each object, decided to start creating such pages for all the objects in my catalog. I will also retain the 50+ entry per page format, as it provides a more convenient way to browse through a number of objects at a time, and will only create individual pages as I have the time. But a few individual pages have been created as an example of the new (additional) format, such as for NGC 1, NGC 2, etc.
Aug 1: Took advantage of an HST image of NGC 4656 to update its entry.
Jul 28: Finished a complete review of NGC 1 - 49, checking/confirming and updating everything (text and images), so that it is now as complete and up to date as currently possible, save for a few minor problems which will hopefully be resolved within a few days. In the meantime I will be starting a similar review and update of NGC 50 - 99. However, progress will be slow through the end of August due to minor medical issues and a hopefully successful effort to view the Aug 21 total solar eclipse.
Jul 9: Still need to finish update of IC 300 - 349, but did finish an iteration of IC 350 - 399.
Jul 4: Completed basic update of NGC 350 - 399; and within a couple of items of finishing similar update of IC 300 - 349.
Jun 28: Posted HST images of NGC 248 and PGC 31693 to the entries of the same name.
Jun 27: Posted an HST image and discussion of PGC 16643.
Jun 26: Posted an HST image and discussion of PGC 52112.
Jun 21: Working on considerable update of IC 300 - 349.
Jun 16 - 20: Completed current iteration of NGC 300 - 349. Also added a discussion of where the material on my NGC/IC Catalog pages comes from (but still need to update the discussion of image sources and copyrights).
Jun 12 - 15: Completed current iteration of IC 250 - 299.
Jun 11: Completed current iteration of NGC 250 - 299.
Jun 10: Completed current iteration of IC 200 - 249. Also revised formatting for erindalepublishing.com as a test of ways to improve tablet viewing of cseligman.com. If the changes prove useful and effective, will start revising the formatting for cseligman.com in bits and pieces over the next few months. If not, will test other approaches beforehand.
Jun 8: Because of the August solar eclipse, posted an updated discussion of safe ways to view the eclipse.
Jun 3: Completed most historical updating for NGC 200 - 249.
Jun 2: Completed current updating of IC 150 - 199.
May 29 - 31: Changed the navigation banner and the NGC/IC/PGC link tables to better accommodate mobile devices (refreshing such devices in landscape mode seems to do a better job of clearing cached files), and started a major overhaul of IC 150 - 199 as a template for a clearer explanation of physical information for galaxies in the NGC/IC/PGC catalogues.
May 28: Finished checking historical and Dreyer entries for NGC 150 - 199.
May 27: Finished adding about a hundred images of NGC 7300 - 7349.
May 13: Have now added several hundred entries and more than a hundred online reference links to Historical Reference Papers for the NGC/IC Objects.
May 12: Finished checking historical and Dreyer entries for NGC 100 - 149 and IC 100 - 149.
May 11: Finished checking historical and Dreyer entries for NGC 50 - 99 (some serious questions remain, but basic work done) and IC 50 - 99.
May 8: Posted an entry and images of PGC 18516, also known as IRAS 06076-2139, due to the publication of an HST image of the pair of interacting galaxies. (More to be added to the discussion later today or tomorrow.)
May 1: Completed entries (and URLs) for all of Guillaume Bigourdan's (currently known) papers shown on the Historical Reference Papers page. (Some reference details differ from Steinike's list; data on my reference page are taken directly from Bigourdan's files.)
Apr 30: Updated Dreyer NGC entries for NGC 7800 - 7840 and NGC 1 - 49, and updated Dreyer IC entries (and added some images) for IC 1 - 49.
Apr 29: Completed Dreyer NGC entries for NGC 7750 - 7799.
Apr 20: Started a page listing the hundreds of references I use for my NGC/IC catalog, and links to online versions of the references.
Apr 18: Completed Dreyer NGC entries for NGC 7700 - 7749.
Apr 16: Completed Dreyer NGC entries for NGC 7650 - 7699.
Apr 15: Completed Dreyer NGC entries for NGC 7600 - 7649.
Apr 14: Completed Dreyer NGC entries for NGC 7550 - 7599.
Apr 11: Completed Dreyer NGC entries for NGC 7450 - 7499 and NGC 7500 - 7549.
Apr 10: Did considerable historical research and unearthed photos of A. N. Skinner and Paul-Pierre and Mathieu-Prosper Henry (also sent to Wolfgang Steinicke, who posted them on his website).
Apr 9: Completed Dreyer NGC entries for NGC 7350 - 7399 and NGC 7400 - 7449.
Apr 8: Completed Dreyer NGC entries for NGC 7300 - 7349.
Apr 6: Completed Dreyer NGC entries for NGC 7250 - 7299.
Apr 5: Completed Dreyer NGC entries for NGC 7200 - 7249.
Apr 4: Completed Dreyer NGC entries for NGC 7100 - 7149 and NGC 7150 - 7199; also added a better image of NGC 7144.
Apr 3: Completed Dreyer NGC entries for NGC 7050 - 7099; also added a better image of NGC 7079.
Apr 2: Completed Dreyer NGC entries for NGC 6950 - 6999 and NGC 7000 - 7049.
Apr 1: Completed Dreyer NGC entries for NGC 6850 - 6899. Also updated the NGC/IC entries for all ten nebulae discovered by Auguste Voigt in 1865, but not published until 1987. Also checked Dreyer NGC entries and discovery data for NGC 6900 - 6949, which is what led to the consideration of Voigt's efforts.
Mar 31: Completed Dreyer NGC entries for NGC 6800 - 6849.
Mar 30: Corrected or explained inconsistent discovery dates for numerous objects observed by William Herschel prior to their "official" discovery dates, e.g. NGC 6802.
Mar 29: Completed Dreyer NGC entries for NGC 6750 - 6799 (though the remaining items from Mar 22 still need to be dealt with).
Mar 27: Completed Dreyer NGC entries for NGC 6700 - 6749 and corrected a longstanding error in the identification of NGC 6748, which turns out to be a misrecorded observation of NGC 6751.
Mar 26: Completed Dreyer NGC entries for NGC 6650 - 6699.
Mar 25: Cleared up the situation with NGC 6607 (though the remaining items from Mar 22 still need to be dealt with), and completed Dreyer NGC entries for NGC 6600 - 6649.
Mar 22: More or less completed a discussion of the confusing situation involving NGC 6607, NGC 6608, NGC 6609 and PGC 61556.
Mar 21: Completed adding Dreyer NGC entries for NGC 6500 - 6549 and NGC 6550 - 6599.
Mar 20: Completed adding Dreyer NGC entries for NGC 6400 - 6449 and NGC 6450 - 6499.
Mar 19: Completed adding Dreyer NGC entries for NGC 6300 - 6349 and checking NGC 6350 - 6399.
Mar 18: Completed Dreyer NGC entries for NGC 6200 - 6249 and NGC 6250 - 6299.
Mar 17: Completed Dreyer NGC entries for NGC 6150 - 6199
Mar 16: Completed Dreyer NGC entries for NGC 6100 - 6149.
Mar 15: Completed Dreyer NGC entries for NGC 6050 - 6099.
Mar 14: Completed Dreyer NGC entries for NGC 5950 - 5999 and NGC 6000 - 6049.
Mar 13: Completed Dreyer NGC entries for NGC 5900 - 5949.
Mar 12: Completed Dreyer NGC entries for NGC 5800 - 5849 and NGC 5850 - 5899. Also corrected a misidentification of a plate flaw as a (nonexistent) galaxy (see NGC 5861 and the following entry).
Mar 11: Completed Dreyer NGC entries for NGC 5700 - 5749 and NGC 5750 - 5799.
Mar 10: Completed Dreyer NGC entries for NGC 5650 - 5699.
Mar 8: Completed Dreyer NGC entries for NGC 5550 - 5599 and started same for NGC 5650 - 5699.
Mar 7: Updated/corrected discovery information for M25 (= IC 4725). Also updated the entries for NGC 7210 and 7487 to reflect the relatively recent discovery that the former was a prior observation of the latter.
Mar 6: Updated NGC 1450, 1451 and 1459 with PanSTARRS images, to supplement the lower quality DSS images. Also corrected errors for NGC 990 (incorrect/incomplete discovery dates) and 1180 (mislabeled image).
Mar 2-4: Finished updating the entries for NGC 1265, IC 312 and PGC 12287.
Feb 25: Gottlieb and Corwin have just shown that NGC 1265 is not PGC 12287, but IC 312. I am too sick to completely update the entries involved, but have posted preliminary corrections that make the situation reasonably clear.
Feb 22: Fixed an error in the discovery information for IC 3927 (thanks to Gary Kronk).
Feb 5: Finished my third novel (An Unsuitable Suit), and will now resume work on this website.

2016 Additions / Changes
Dec 12: Took advantage of a recent HST image of spiral galaxy NGC 4388 to update its entry.
Dec 11: Took advantage of a recent HST image of irregular galaxy IC 3583 to update its entry.
Dec 2: Posted images and a discussion of variable Seyfert galaxy Markarian 1018.
Nov 22: Posted just-released HST image of spiral galaxy NGC 3274.
Nov 21: Fixed an error in the entry for NGC 1641, which is usually listed as part of the Large Magellanic Cloud, but is actually part of our own galaxy.
Nov 20: Resumed updating of NGC 1550 - 1599. Also finished the first draft of my third novel, so should start making more progress on this site in the not too distant future.
Nov 14: Posted just-released HST image of dwarf irregular galaxy PGC 43869 (= "NGC 4789A").
Nov 7: Posted new HST image of NGC 1222, and discovered I hadn't finished updating NGC 1200 - 1249, so rectified that mistake.
Nov 1 - 5: Continued updating NGC 1550 - 1599 to current "minimum" standard.
Oct 29 - 31: Completed current iteration of NGC 1500 - 1549 and started updating NGC 1550 - 1599.
Oct 28: Added a new HST image of the Crab Nebula (M1); also continued updating NGC 1500 - 1549.
Oct 25 - 26: Returned to updating NGC 1500 - 1549. Also decided to create a new template for PGC objects, to reduce the number of objects on a single page, and used a previously empty page (PGC 121000 - 121499) to try it out, creating four additional pages (e.g., PGC 121100 - 121199) to reduce the number of objects per page from 500 to 100. It will take quite a while to do the same for all the PGC pages (especially since this is a low-priority matter), and the link table will remain as-is, only linking to the first page out of a group of five pages, to keep its size more manageable.
Oct 24: Posted a recent HST image and comment for globular cluster NGC 362.
Oct 22: Completed current iteration of IC 1550 - 1599.
Oct 21: Updated entries for NGC 5562 and 5584 due to a query about the latter galaxy's discovery. Also resumed work on IC 1550 - 1599.
Oct 20: Altered the entries for NGC 457, 1981, 2129, 2169, 2232, 2281 and 6871 to reflect Wolfgang Steinicke's recent discovery that William Herschel observed these objects (though not as "clusters") during his early studies of double stars (that is, prior to his efforts to discover nebulae and clusters of stars).
Oct 19: Returned to updating IC 1550 - 1599.
Oct 17: Took advantage of the release of a HST image of NGC 299 to replace the 'raw' Hubble Legacy Archive image of the open cluster.
Oct 16: Updated the home page and scrollable fiction banner at the top of all other pages to reflect the release of the five short stories in "Short Shorts" as individual Kindle "singles".
Oct 11 - 13: Due to the (incorrect) suggestion that IC 1560 might be NGC 164, started updating IC 1550 - 1599.
Oct 10: Added a new HST image of NGC 278.
Oct 7 - 10: Added previously incomplete discovery information for NGC 100 - 149 and started the same for NGC 150 - 199. Also started updating some of the NGC/IC Discoverers entries.
Oct 7: Updated discovery information for several Messier objects (see here for details).
Oct 5 - 6: Started updating NGC 1500 - 1549.
Sep 28 - Oct 4: Completed current iteration of NGC 1450 - 1499.
Sep 26: Added a newly released HST image of NGC 24 to its entry; also continued to update NGC 1450 - 1499.
Sep 24 - 25: Started updating NGC 1450 - 1499.
Sep 13 - 23: Completed current updating of NGC 1400 - 1449. (delayed by a death in the family)
Sep 12: Took advantage of a newly released HST image of PGC 83677 to post pictures and a discussion of that galaxy.
Sep 9 - 11: Continued updating NGC 1400 - 1449.
Aug 29 - Sep 8: Finished updating NGC 1350 - 1399, started NGC 1400 - 1449.
Aug 25 - 27: Finised basic updating NGC 1300 - 1349; started updating NGC 1350 - 1399.
Aug 23 - 24: Finished basic updating of NGC 5250 - 5299.
Aug 22: To take advantage of a new HST image of NGC 5264, added Steinicke and partial Dreyer historical data to NGC 5250 - 5299
Aug 16 - 21: Continued updating NGC 1300 - 1349.
Aug 15: Took advantage of just-posted HST images of Pisces A and Pisces B to do entries for those galaxies.
Aug 14 - 15: Started updating NGC 1300 - 1349.
Aug 9 - 13: Completed current iteration of NGC 1250 - 1299.
Aug 8: Took advantage of a just-posted HST image of NGC 2337 to do a detailed entry for that galaxy.
Aug 4 - 8: Continued work on NGC 1250 - 1299.
Aug 3: Posted images of NGC 4833 and continued work on NGC 1250 - 1299.
Jul 31 - Aug 2: Continued work on current iteration of NGC 1250 - 1299.
Jul 30: Completed current iteration of NGC 1200 - 1249, started on NGC 1250 - 1299.
Jul 29: Added an image of the Moon passing in front of the Earth during a solar eclipse to Pictures of the Moon.
Jul 26: Changed the entries for NGC 832 and NGC 1226 to reflect the recent discovery that they are probably duplicate entries.
Jul 18 - 25: Continued updating NGC 1200 - 1249.
Jul 17: Posted an update to Browser Help explaining how to reach the target of a broken link (caused by the target page either disappearing or its website being reorganized).
Jul 13 - 16: Started updating NGC 1200 - 1249. Also posted images and a discussion of the peculiar galaxy PGC 7090. Also posted notes about Arp 310 and 311, and a warning about occasional misidentifications of Arp 310 as NGC 1259 (it is actually IC 1259).
Jul 9 - 13: Considerably updated NGC 1150 - 1199. Also posted images and a discussion of the Hubble Picture of the Week of PGC 56779.
Jul 6 - 9: Completed basic updating of NGC 1100 - 1149. Also added a Warning About Load Time for Some Sky Atlas Pages to the banner at the top of every page on this site.
Jul 2 - 5: Posted positions and wide-field images for all Hickson Compact Groups, and started altering NGC entries for HCG members to take advantage of that. Posted brief notes about a possible identification of the otherwise "lost or nonexistent" NGC 111. Also posted a biography and images for Auguste Voigt.
Jun 30 - Jul 1: Started updating formatting for NGC 1150 - 1199; also updated data and images for Hickson Compact Groups 11, 12 and 21.
Jun 27 - 28: Finished formatting/pix/tags through NGC 1099. Checked Corwin positions and added/checked original NGC entries through 1149. Started updating formatting for NGC 1100 - 1149.
Jun 16 - 19: Completed NGC entries for NGC 1050 - 1099, updated formatting/pix through NGC 1093.
Jun 13 - 15: Updated formatting and many images for NGC 200 through 249.
Jun 12: Updated formatting and numerous images for NGC 127 through 149.
Jun 7: Added another image of the Hoba meteorite to the page about Meteorites, and enlarged on the comments about the object. Also, due to a recent Hubblesite post about UGC 4879 (= PGC 26142), posted images and a preliminary discussion of that galaxy.
Jun 4 - 5: Updated formatting and numerous images for NGC 191 through 199, and NGC 124 through 126.
May 29 - Jun 1: Updated Corwin positions through NGC 1099, added and/or verified original NGC entries, updated formatting and added many images through NGC 1052. Also updated formatting and images for NGC 150 - 190, as that task was overlooked while otherwise updating NGC 124 - 249 in March.
May 24: Updated Dreyer entries/etc through NGC 990.
May 21: Posted a discussion and images of the Vela Ring Galaxy and its companion..
May 19 - 21: Updated Dreyer entries/etc through NGC 970.
May 19: Posted a first draft of The Effect of Metals On Heat Flow Inside Stars, and moved The Extremely Metal-Poor Galaxy AGC198691 to that page.
May 18: Updated Dreyer entries/etc through NGC 952; as a result, also modified the entry for NGC 940.
May 16 - 17: Updated Corwin positions through NGC 999, Dreyer entries, pix etc through NGC 949.
May 15: Updated Dreyer entries, formatting and added/updated pix through NGC 899.
May 15: Posted a temporary entry for extremely "metal-poor" dwarf irregular galaxy AGC198691.
May 10 - 14: Updated Corwin positions through NGC 899, Dreyer entries, current formatting and new/updated pix through NGC 879.
May 7 - 10: Updated Corwin positions, Dreyer entries and current formatting through NGC 849, added or updated many images and used them to correct several galaxy types and sizes.
Apr 30 - May 6: Updated Dreyer entries through NGC 799, Corwin positions through NGC 799, adding or updating many images.
Apr 22 - 25: Updated Dreyer entries through NGC 733, Corwin positions through NGC 749, also adding many images.
Apr 19: Updated Dreyer entries through NGC 655 and Corwin positions through NGC 699.
Apr 16 - 18: Updated Dreyer entries and Corwin positions through NGC 649, added several images, including an HST image of low-surface brightness galaxy PGC 2699.
Apr 12 - Apr 13: Updated Dreyer entries through NGC 594; also added numerous images.
Apr 11: Updated Corwin positions through NGC 599, and Dreyer entries through NGC 556.
Apr 10: Updated Corwin positions through NGC 549, and Dreyer entries through NGC 541.
Apr 9: Updated Dreyer entries through NGC 499.
Apr 8: Updated Dreyer entries through NGC 465, Corwin positions through NGC 499.
Apr 6: Updated Dreyer entries through NGC 437 (also added several new/better images).
Apr 4: Updated Corwin positions through NGC 449, and Dreyer entries through NGC 425.
Apr 3: Updated Corwin positions through NGC 399, and also Dreyer entries through NGC 399.
Mar 17 - Apr 3: Adding/checking original Dreyer NGC entries from start of catalog; finished NGC 1 - 369 as of this post. (Have found a few errors caused by mis-copying information from the NGC, so checking my entries for accuracy is critical.) Also doing considerable updating to current catalog format, hence relatively slow progress.
Mar 13-16: Checking updated Corwin positions from start of catalog; finished NGC 1 - 369 as of this post.
Mar 13: Still working on corrections and updates for NGC 5000 - 5699, but though have made a lot of progress, haven't fully finished any of the pages involved, hence the lack of specific updates; but hopefully posts about finished pages will start showing up by the end of the month.
Feb 23: Working on updates for NGC 5500 - 5549, 5550 - 5599 and 5600-5649. The first page is nearly complete, the second is well under way but still far from complete, and I have just started updating the third. Aside from the obligations noted above, one of the websites that I use as a major reference has been offline more often than not for several weeks, and replacing it is proving difficult, so unless I can find an appropriate work-around, progress on some parts of the NGC/IC catalog will be slower than usual. However, I will continue to update everthing that does not depend on that reference, so though it may take a while before I can say that any given page is truly complete, over a period of time there will be substantial improvements in the catalog.
Feb 6: Added a note to The Heliosphere about The Edge Of The Solar System, to clear up a common misconception (due to poorly written news articles) about whether the Voyager spacecraft have left the Solar System or not (they have not).
Jan 11-12: Added Dreyer's NGC entries to NGC 5500 - 5549.

2015 Additions / Changes
Dec 30: Fixed some problems with NGC 5500 - 5549 and posted images of Arp 199.
Dec 29: Compared Steinicke's revised database to NGC 5500 - 5599.
Dec 28: Compared Steinicke's revised database to IC 3250 - 3299. Also posted identifications of NGC 5632, 5651, 5658 and 5922 as duplicates of NGC 5691, 5713, 5719 and 5923.
Dec 27: Compared Steinicke's latest revision of NGC/IC discovery information to my catalog starting at IC 3000 - 3049 through IC 3200 - 3249.
Dec 26: Finished adding missing pages (primarily placeholders) for PGC 68000 to PGC 129999.
Dec 13: Finished adding Share to Facebook buttons to all existing pages.
Nov 16: Substantially enlarged a biography of Adolphus Albert Le Sueur, first observer for the Great Melbourne Telescope.
Nov 11: Added a discussion of tidal effects on moons to the page about The Moons of Mars.
Oct 23: Corrected a typographical error in one of the equations on the page about Ellipses and Other Conic Sections.
Sep 26: Posted a detailed discussion of the Lunar Eclipse Details for Sep 27 - Sep 28, 2015.
Sep 23: Started a page containing A List of Solar and Lunar Eclipses.
Aug 30: Decided to add a couple of steps to my historical research for NGC/IC objects, to help explain problems with historical identification where they occurred; as a result, all previously so-called "complete" pages may have some minor changes made in the discussion of objects that suffered such problems. Hopefully the result will be to better clarify the problems and their resolution for the benefit of those interested in such things, and readers not interested in the historical discussion can just skip to the physical information and images, as before.
Aug 30: Because of the discovery of a binary black hole in the nearest quasar, posted images and a discussion of the galaxy involved.
Aug 29: In response to a query, posted a discussion and images of the so-called Sacred Mushroom.
Aug 24: Added NGC entries for NGC 3400 - 3449, NGC 3450 - 3499, NGC 3500 - 3549 & NGC 3550 - 3599.
Aug 23: Posted nearly complete page for NGC 3650 - 3699, added NGC entries for NGC 3600 - 3649.
Aug 7: Posted partially complete page for NGC 3050 - 3099.
Jul 29: Posted nearly complete page for NGC 3000 - 3049.
Jul 28: Completely finished page for NGC 3100 - 3149, including updating related PGC pages.
Jul 21-22: Fixed about a hundred broken links, and added several images of Vesta.
Jul 11 - 16: Posted New Horizons images on Pictures of Pluto and The Satellites (Moons) of Pluto.
Jul 14: Posted false-color "geological"-type images of Pluto and Charon taken on July 13, 2015.
Jul 12: Completely finished page for NGC 3150 - 3199, including updating related PGC pages.
Jul 12: Posted the latest images of the "nearside" and "farside" of Pluto.
Jun 28: Posted the artwork I created for the cover of my third novel, An Unsuitable Suit.
June 22: Completely finished page for NGC 2900 - 2949, including updating related PGC pages.
May 30: Completely finished page for NGC 2950 - 2999.
May 19 - 22: Made some corrections on pages for NGC 2000 - 2049, NGC 3350 - 3399 and NGC 3500 - 3549.
May 19: Substantially updated page for NGC 2900 - 2949, which was a nearly blank page; but still needs some work.
May 15: Posted an animation of a Martian sunset as seen On The Surface Of Mars.
Apr 30: Completed page for NGC 50 - 99.
Apr 17: Save for editing confused history of discovery for NGC 16, completed page for NGC 1 - 49.
Apr 4: Posted a low-resolution image of the total lunar eclipse of said date.
Apr 2-4: Replaced Steinicke's positions for NGC 1 - 149 with positions by Brian Skiff and Harold Corwin. Also considerably (though not completely) updated format for the corresponding entries to current standard. Also replaced a number of images with better ones. Also updated Dreyer NGC entries and discovery information for NGC 1 - 120.
Mar 28: Posted a brief discussion of the total lunar eclipse of Apr 4, 2015, and a link to a detailed image of the circumstances of the eclipse.
Mar 28: Completed a detailed recheck and update of all discovery information for Steinicke and Dreyer for NGC 50 - 99; will be gradually revising and updating the entire NGC/IC catalog because (1) never finished entering all of Dreyer's entries and (2) Steinicke made hundreds of changes in the latest version of his numerous databases.
Mar 26-28: Discovered and after some delay fixed a painfully confused historical identification of NGC 57, which turned out to have been correct in the first place despite the confusion.
Mar 21: Received confirmation that NGC 468 is not IC 92, but as I suspected a duplicate of NGC 472; posted essentially final entries for the three objects.
Mar 20: Developed suspicion that the half-century old historical identification of NGC 468 as IC 92 was incorrect; posted temporary revisions.
Mar 11: Working on IC 50 - 99, noticed some discrepancies between my original reference for Dreyer's NGC entries and the actual entries (which were not available to me at the start of this project). Checked IC 1 - 99 against the original Dreyer catalogs, found and fixed a few minor errors. As a result, changed the date for completing IC 1 - 49 to March 11.
Mar 10: Due to an HST press release of Mar 9, added an entry for UGC 8201 (= PGC 45372). Also (due to starting final update for IC 50 - 99) posted an HST image of Arp 230, also known as IC 51.
Mar 9: Thought I completed the final update for IC 1 - 49, the first page in my catalog to be completely finished (barring future discoveries); but see the entry for Mar 11.
Feb 28: Started updating NGC 6900 - 6949.
Feb 24: Started final update for IC 1 - 49.
Feb 21: Posted a page about The Synodic Period of Revolution, which is the time it takes a planet to move from one aspect to the next occurrence of the same aspect (e.g., from opposition to opposition).
Feb 20: Finally completed the correction of html code, typographical and grammatical errors and the addition of minor updates to all 1200 pages on my website. Most of the errors were so minor that no one should notice any changes; but there were enough of them (and a few major errors) to make the tedious work as worthwhile as it was necessary.
Feb 16: Fixed a typographical error that kept the Polar Animation page from displaying the animation. Apologies to anyone who tried to view it in the (years?) since the error was introduced.
Feb 14: Added images of constellation figures to Stars and Constellations.
Feb 12: Posted a page about Leap Seconds.
Feb 4 onward: Continued to work on updating and editing html code, text and captions for the few remaining pages requiring it (see note of Feb 16 for the worst error uncovered so far).
Feb 3: Posted HST images of NGC 7714 and NGC 7715.
Feb 2: Posted some corrections and clarifications suggested by a private communication.
Jan 31/Feb 1: Created and/or updated entries for Hickson Compact Group 90 and its members.
Jan 30: Created and/or updated entries for Hickson Compact Group 100 and its members.
Jan 29: Began another round of minor corrections (fortunately mostly very minor) similar to those of Jan 9 - 21. In doing so, realized that there are significant problems with the identifications of a number of objects on the page dealing with NGC 6450 - 6499, so added a warning for the six objects in question.
Jan 24: Started updating the page of Messier Nebulae.
Jan 23: Finally finished the updating of Messier Galaxies page started on Dec 27, along with all NGC entries linked to the M-galaxies page.
Jan 9 - 21: Substantially updated a dozen or two NGC Object entries due to a private communication pointing out some minor errors in said entries. A couple were due to typographical errors on my part, but most of the errors were due to mistakes in the source material that have been corrected since I copied them. In some cases the mistakes went back more than a century, meaning that similar errors exist in many other databases; as an example, see NGC 7234. Also updated a number of other entries that were near the ones in question to bring them up to current standards, but nothing worth listing as a separate update.
Jan 6: Posted new HST image of the Pillars of Creation.
Jan 3: Updated the page that discusses known display and printing issues (Browser Help).

2014 Additions / Changes
Dec 24 - 30: Continued updating and editing noted for Nov 19 - Dec 23. Starting Dec 27, concentrated on exhaustive updating of Messier Galaxies and entries on other pages linked to that page. As of Dec 30, about 70% done with the M-galaxy page and linked entries.
Dec 25: Based on new HST image, updated entry for IC 335.
Nov 19 - Dec 23: Continued the updating and editing noted for Nov 4 - 18, and have now completed minor corrections for about 1500 pages, and major alterations for a dozen or so pages. This leaves only a few hundred pages to go, so should return to major additions and updating of NGC/IC entries in early to mid January.
Nov 19: In response to a request, created a complete entry for NGC 5368.
Nov 18: In response to requests, created complete entries for NGC 4157 and NGC 7183.
Nov 4 - Nov 18: Working on updating and correcting code for all non-Atlas pages, and fixing numerous minor typographical and grammatical errors.
Nov 3: Added Cassini image of Mimas to the page about that moon.
Sep 11 - Nov 2: Updated and corrected code for all 160 NGC Object pages, and updated formatting (and to a lesser extent content) of text, pictures, tags and captions for several thousand NGC entries.
Sep 10: Updated (preliminary) entries for NGC 6353 and 7438.
Sep 6/8: Did some work on Hickson Compact Groups and associated pages.
Sep 2/3: Updated Steinicke discovery/physical data and updated formatting for NGC 1850 - 1899.
Sep 1: Added basic Dreyer listings for NGC 1850 - 1899.
Aug 29/31: Updated discovery/physical information and added Dreyer listings for NGC 1750 - 1799 and NGC 1800 - 1849.
Aug 26/28: Posted a major (albeit incomplete) update of page for NGC 1700 - 1749; also posted a few corrections for NGC 1800 - 1849.
Aug 23/25: Completed updates and second iteration of page for NGC 1600 - 1649.
Aug 21/22: Continued updates for NGC 2050 - 2099.
Aug 19/20: Updated discovery and other information for objects observed by John Herschel at the Cape of Good Hope between 1834 and 1838 (see NGC 2050 - 2099 and NGC 3250 - 3299).
Aug 18: Posted animation of the conjunction of Venus and Jupiter in the morning sky from Aug 14 to Aug 22.
Aug 17: Posted improved discussions and/or images of NGC 1783, NGC 6365, NGC 993 = NGC 994 and NGC 3314.
Aug 16: Posted numerous additions to NGC 1500 - 1549, and updated evening planet diagrams for The Wanderers, or "Planetes".
Aug 15: Posted a few additions to NGC 1950 - 1999.
Aug 13: Posted minor corrections to IC 2000 - 2049.
Aug 12: Posted numerous additions to NGC 1550 - 1599.
Aug 11: Updated evening planet diagrams for The Wanderers, or "Planetes".
Aug 10: Posted numerous additions to NGC 3100 - 3149.
Aug 8: Posted some additions to NGC 4850 - 4899.
Aug 6: Updated diagrams for The Wanderers, or "Planetes", and posted partially upgraded version of page for NGC 3100 - 3149.
Aug 4: Posted considerably upgraded version of page for NGC 4850 - 4899.
Aug 2: Posted preliminary version of page for IC 5250 - 5299 and somewhat updated pages for IC 1000 - 1049, IC 1150 - 1199 and IC 1200 - 1249.
Jul 31: Finished fairly complete version of page for IC 5150 - 5199 and preliminary version of IC 5200 - 5249.
Jul 25: Posted entry for PGC 67907 and added diagrams showing the position of "evening" planets to The Wanderers, or "Planetes".
Jul 21: Finished preliminary post for NGC 3200 - 3249.
Jul 13: Completed nearly final post for IC 5050 - 5099.
Jul 8: Posted images and (updated and corrected) discussion of NGC 5775.
Jul 7: Posted images and discussion of NGC 6118. Also added recent HST image of NGC 201.
Jul 4: Recoded page so Maxwell's Equations are properly displayed in browsers that don't support Symbol.
Jun 6: Posted nearly final page for IC 5100 - 5149.
May 22: Posted nearly final page for IC 5000 - 5049.
May 15: Posted nearly final page for IC 4950 - 4999.
Apr 20: Posted nearly final page for IC 4900 - 4949.
Apr 13: Posted nearly final page for IC 4850 - 4899.
Apr 9: Posted diagrams of the total lunar eclipse of Apr 14/15, 2014.
Apr 8: Added pages providing direct links for every NGC object: NGC 1-2000, 2001-4000, 4001-6000 and 6001-7840.
Apr 5: Posted nearly final page for IC 4800 - 4849.
Mar 24: Posted nearly final page for IC 4750 - 4799.
Mar 18: Updated The Oppositions of Mars to show oppositions through 2020.
Mar 13: Posted nearly final page for IC 4700 - 4749.
Mar 7: Posted nearly final page for IC 4650 - 4699.
Feb 27: Posted nearly final page for IC 4600 - 4649.
Feb 20: Posted nearly final page for IC 4550 - 4599.
Feb 15: Posted nearly final page for IC 4500 - 4549.
Feb 8: Posted moderately thorough page for IC 4450 - 4499.
Feb 7: Posted updated and nearly final version of page for NGC 1 - 49.
Jan 5: Posted moderately thorough page for IC 4400 - 4449.