Sosigenes is a lunar

impact crater An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact crater ...

on the west edge of

Mare Tranquillitatis Mare Tranquillitatis ( Latin ''tranquillitātis'', the Sea of Tranquillity or Sea of Tranquility; see spelling differences) is a lunar mare that sits within the Tranquillitatis basin on the Moon. It is the first location on another world to ...

. Its diameter is 17 km. It was named after ancient Greek astronomer

Sosigenes of Alexandria Sosigenes ( grc-gre, Σωσιγένης) was an ancient astronomer. According to Pliny the Elder's '' Natural History'' 18.210–212, Julius Caesar consulted him while he was designing the Julian calendar. Biography Little is known about him a ...

. It lies to the east of the large walled plain Julius Caesar. The crater rim has a high

albedo Albedo (; ) is the measure of the diffuse reflection of solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a body that refl ...

, making it relatively bright. It has a small central rise at the midpoint of the floor. To the east on the

mare A mare is an adult female horse or other equine. In most cases, a mare is a female horse over the age of three, and a filly is a female horse three and younger. In Thoroughbred horse racing, a mare is defined as a female horse more than f ...

is a formation of parallel

rille Rille (German for 'groove') is typically used to describe any of the long, narrow depressions in the surface of the Moon that resemble channels. The Latin term is ''rima'', plural ''rimae''. Typically, a rille can be several kilometers wi ...

s designated the Rimae Sosigenes. These follow a course to the north, and have a length of about 150 kilometers. The small, bowl-shaped crater Sosignes A lies across one of these rilles.

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 Sosigenes. Sosigenes lunar crater map

Sosigenes Irregular Mare Patch M1108117962

References

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External links

at The Moon WikiRimae Sosigenes at The Moon Wiki
- on its rille
LTO-42D4 Sulpicius Gallus
— L&PI

topographic map In modern mapping, a topographic map or topographic sheet is a type of map characterized by large-scale detail and quantitative representation of relief features, usually using contour lines (connecting points of equal elevation), but histori ...

Is the Moons' Fault
- the rille Rimae Sosigenes not mentioned in that article * - one of the craters depicts Sosigenes * {{cite web , last = Wood , first = Chuck , date = April 26, 2006 , url = http://www.lpod.org/?m=20060426 , title = Dead Romans, publisher = Lunar Photo of the Day , access-date = 2006-07-12 , url-status=dead, archive-url=https://web.archive.org/web/20110614233616/http://www.lpod.org/?m=20060426, archive-date=June 14, 2011 Impact craters on the Moon