Byrgius (crater)

Byrgius is a lunar impact crater located in the western part of The Moon, near the limb. As a result, Byrgius appears strongly oval in shape due to foreshortening. It lies northwest of Vieta.^[2] To the northwest is the nearly ruined crater Lamarck.^[3] The low rim of Byrgius is worn and eroded,^[2] with Byrgius A overlying the eastern rim and Byrgius D lying across the northwest. The floor of Byrgius is relatively flat and undistinguished by significant craters.^[4]: 92 Byrgius A possesses its own ray system that crosses Byrgius,^[5] and extends for over 300 kilometres.^[6] This fresh crater has an estimated age of around 48 million years.^[7]

LocationThe Moon

Coordinates24.7°S 65.3°W / -24.7; -65.3

Diameter84.46 km (52.48 mi)^[1]

Depth4.6 km (2.9 mi)

Quick facts Location, Coordinates ...

Byrgius Crater

Lunar Orbiter 4 image of Byrgius, with Byrgius A at right, and Byrgius D in upper left
Location	The Moon
Coordinates	24.7°S 65.3°W / -24.7; -65.3
Diameter	84.46 km (52.48 mi)[1]
Depth	4.6 km (2.9 mi)
Age	c. 48 million years
Eponym	Joost Burgi

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This crater is named after Swiss horologist Jost Burgi.^[1] His name was introduced into lunar nomenclature in 1651 by Giovanni Ricciolli.^[8] The designation was formally adopted by the International Astronomical Union in 1651.^[1]