From Surf Wiki (app.surf) — the open knowledge base
Rupes Recta
Linear fault on the Moon
Linear fault on the Moon
Rupes Recta is a linear fault on the Moon, in the southeastern part of the Mare Nubium at . The name is Latin for straight cliff, although it is more commonly called the Straight Wall. This is the best-known escarpment on the Moon, and is a popular target for amateur astronomers.

When the sun illuminates the feature at an oblique angle at about day 8 of the Moon's orbit, the Rupes Recta casts a wide shadow that gives it the appearance of a steep cliff. The fault has a length of 110 km, a typical width of 2–3 km, and a height of 240–300 m. Thus although it appears to be a vertical cliff in the lunar surface, in actuality the grade of the slope is relatively shallow.
To the west of this escarpment is the crater Birt, which is about 17 km in diameter. Also to the west is the Rima Birt rille. At the southern end is a group of hills often called the "Stag's-Horn Mountains", although this name is not officially recognized by the IAU.
To the northeast is the crater Alpetragius, and to the east is Thebit.
References
References
- North, Gerald. (2007). "Observing the moon: the modern astronomer's guide". Cambridge University Press.
- Grego, Peter. (2005). "The moon and how to observe it". Birkhäuser.
- Wood, Charles A.. "The Lunar 100". Sky Publishing.
- Nathan, Steve A.. "Lunar Club Observing List". Astronomical League.
This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.
Ask Mako anything about Rupes Recta — get instant answers, deeper analysis, and related topics.
Research with MakoFree with your Surf account
Create a free account to save articles, ask Mako questions, and organize your research.
Sign up freeThis content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.
Report