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Byrgius - and La Paz (Byrgius A) on the eastern part of its rim

Lat: 24.7°S, Long: 65.3°W, Diam: 87 km, Depth: 2.13 km, Rükl: 50

external image normal_Byrgius_LO_iv_168_h1.jpg
LO IV 168 H1
Byrgius with 18.5 km ray-crater Byrgius A (once called La Paz by H.P.Wilkins and P.Moore) at 3 o'clock. The 27 km crater at 10 o'clock is Byrgius D.


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Description: Elger

(IAU Directions) BYRGIUS.--A very irregular enclosure, about 40 miles in diameter, between Cavendish and the W. limb, with a lofty and discontinuous border, rising at one point on the W. to a height of 7000 feet above the floor. There are wide openings both in the N. and S. wall, and some ridges within. The border is broken on the W. by a crater, and on the E. by the well-known crater Byrgius A, from which a number of bright streaks radiate, mostly towards the W. One on the E. extends to Cavendish, and another to Mersenius, traversing the ring-plain Cavendish C. North-west of Byrgius there is a mountain arm which includes a peak 13,000 feet in height.

Description: Wikipedia


Additional Information


  • Named for Joost Bürgi (February 28, 1552 - January 31, 1632), a Swiss clockmaker and mathematician. He invented logarithms independently of John Napier, since his method is distinct from Napier's. Napier published his discovery in 1614, and this publication was widely disseminated in Europe by the time Bürgi published in 1620, at the behest of Johannes Kepler.
  • The bright ray-crater Byrgius A was called La Paz by Hugh Percy Wilkins and Patrick Moore, but the IAU did not accept that name. According to the book The Moon by Wilkins and Moore, La Paz was a contemporary American astronomer. It would be interesting to know if La Paz could also have been the controversial investigator Lincoln La Paz of the so-called "green meteors" over the northern USA in 1948. Research Lincoln La Paz: Danny Caes.

LRO Links

  • LROC Featured Image: Out of the Shadows: Impact Melt Flow at Byrgius A Crater

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