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. To the northwest is the nearly ruined crater Lamarck.
The low rim of Byrgius is worn and eroded, 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. Byrgius A possesses its own ray system that crosses Byrgius, and extends for over 300 kilometres. This fresh crater has an estimated age of around 48 million years.
This crater is named after Swiss horologist Jost Burgi. His name was introduced into lunar nomenclature in 1651 by Giovanni Ricciolli. The designation was formally adopted by the International Astronomical Union in 1651.
Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Byrgius.
ByrgiusLatitudeLongitudeDiameterA24.5° S63.7° W19 kmB23.9° S60.8° W23 kmD24.1° S67.1° W27 kmE23.5° S66.2° W18 kmH23.7° S62.4° W27 kmK23.0° S61.8° W14 kmN22.3° S63.1° W20 kmP22.6° S64.1° W19 kmR26.5° S60.7° W7 kmS26.2° S61.4° W43 kmT25.1° S61.5° W5 kmU25.8° S67.2° W13 kmV26.0° S67.8° W9 kmW26.1° S68.5° W14 kmX25.7° S65.4° W6 km
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