Celestial Atlas: Obsolete Constellations
Quadrans Muralis: The Mural Quadrant
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     Quadrans Muralis, or the Mural Quadrant, is an obsolete constellation that was located between Draco, Hercules and Bo÷tes. It is primarily of interest today because a meteor shower (the Quadrantids) is named after it. A mural quadrant is a device mounted parallel to the celestial meridian to accurately observe the altitudes of stars. An illustration of Tycho Brahe's mural quadrant is shown below.
Watercolored version of old woodcut showing Tycho Brahe's mural quadrant

Historical Map of Quadrans Muralis
From Bode's 1801 Uranographia (Image Credit and © Tartu Observatory Virtual Museum; used by permission)
Map of region near Quadrans Muralis from Bode's Uranographia
Celestial Atlas: Obsolete Constellations
Quadrans Muralis: The Mural Quadrant