Crater characteristics
The lunar crater Birt and its environs.
Coordinates	22°24′S 8°30′W / 22.4°S 8.5°W / -22.4; -8.5Coordinates: 22°24′S 8°30′W / 22.4°S 8.5°W / -22.4; -8.5
Diameter	17 km
Depth	3.5 km
Colongitude	9° at sunrise
Eponym	William R. Birt

Birt is a lunar impact crater that is located in the eastern half of the Mare Nubium. To the east of the crater is the Rupes Recta, a long, linear feature commonly called the Straight Wall. In actually this is only a slight rise in the surface of the mare with a maximum height of about 240 meters. It has a width of about 2.5 kilometers and is 100 kilometers in length.

Birt is a bowl-shaped formation with a raised rim. It is slightly intersected along the southeast rim by the much smaller crater Birt A. To the west of Birt, a rille named Rima Birt runs north-northwest in an arc from Birt F to Birt E.

[edit] Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Birt.

[edit] References

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• Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 0-521-62248-4. 
• Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 1852331933.