Rimae Sirsalis

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Rimae Sirsalis

Lat: 15.7°S, Long: 61.7°W, Length: 426 km, Depth: km, Rükl: 50

external image normal_SirsalisRille.jpg
Tom Bash, Sirsalis, Sirsalis Rille (center), Grimaldi (upper left). See this LPOD for the identification of the features.


LPOD Photo Gallery Lunar Orbiter Images


(LAC zone 74D3) LAC map Geologic map


Description: Elger

One of the longest clefts on the visible surface runs immediately E. of this formation Sirsalis. Commencing at a minute crater on the N. of it, it grazes the foot of the E. glacis; then, passing a pair of small overlapping craters (resembling Sirsalis and its companion in miniature), it runs through a very rugged country to a ring-plain W. of De Vico (De Vico a), which it traverses, and, still following a southerly course, extends towards Byrgius, in the neighbourhood of which it is apparently lost at a ridge, though Schmidt and Gaudibert have traced it still farther in the same direction. It is at least 300 miles in length, and varies much in width and character, consisting in places of distinct crater-rows.

Description: Wikipedia

Rimae Sirsalis

Additional Information


  • Named from nearby crater. (Sirsalis)
  • In the original IAU nomenclature of Blagg and Müller (1935) there were three Roman-numeralled rilles associated with Sirsalis (I, II, and III), and a separate feature known as the Sirsalis Cleft.
  • This name (presumably the latter one) was Latinized to Rima Sirsalis in 1964 IAU Transactions XIIB.
  • The deep southern end of the rille was known as Rima Byrgius (and, before that, the Byrgius Cleft).
  • It is not entirely clear when these rille names were consolidated into the present Rimae Sirsalis.

LPOD Articles

The Longest Rille A Rille Draped Across the Landscape A Long Graben

Lunar 100

L77: Procellarum basin radial rilles.


Wood, C.A. 10/2005. The Straight Story on Linear Rilles. S&T 110(4):62-63
Harold Hill. A Portfolio of Lunar Drawings, pages 144, 145.