# Euler

## Contents

# Euler

Lat: 23.3°N, Long: 29.2°W, Diam: 27 km, Depth: 2.24 km, Rükl: 20, Eratosthenian |

## Images

LPOD Photo Gallery Lunar Orbiter Images Apollo Images ASU Image of the Week (Figure 2, the second photo, which is **Euler** instead of Aristarchus, research Danny Caes).

## Maps

*(LAC zone 40D1)* LAC map Geologic map LTO map

## Description

## Description: Elger

*(IAU Directions)* EULER.--The most westerly of the row of great ring-plains, which, beginning on the E. with Autolycus, and followed by Archimedes, Timocharis, and Lambert, extends almost in a great circle from the N.E. to the S.W. side of the Mare Imbrium. It is about 19 miles in diameter, and is surrounded by terraced walls, which, though of no great height above the Mare, rise 6,000 feet above the floor. There is a distinct little gap in the S. wall, easily glimpsed when it is close to the morning terminator, which probably represents a small crater. Euler has a bright central mountain, and is a centre of white silvery streaks.

## Description: Wikipedia

## Additional Information

- Depth data from Kurt Fisher database

Arthur, 1974: 2.24 km

Westfall, 2000: 2.24 km

Viscardy, 1985: 2.24 km

Cherrington, 1969: 0.67 km - From the shadows in AS17-M-2923,
**Euler**is about 2350 m deep. - Jim Mosher - Included in ALPO list of bright ray craters
- Thermal anomaly crater, implying youthful age - Moore et al, 1980
**Euler Gamma**(19°30' North/ 28°30' West; south-southeast of Euler itself) is a very interesting target for lunar observers with powerful telescopes, because of the half-submerged craterlet at Euler Gamma's lower southeastern flanks. This half-submerged craterlet is described in Harold Hill's book (see bibliography below). Three orbital Hasselblad photographs made during the mission of Apollo 17 show Euler Gamma and its half-submerged craterlet. These photographs are: AS17-151-23268 , 23269 , and AS17-139-21292. Research: Danny Caes- A very interesting close-up of
**Euler Gamma**is included in panoramic frame AS17-P-3103 (left part of this photograph). Research: Danny Caes - Another Apollo-photograph of
**Euler Gamma**appeared in*APOLLO OVER THE MOON; A VIEW FROM ORBIT*, Chapter 5: Craters (Part 3), Figure 126 (Euler Gamma is in the lower left corner of this photograph). Research: Danny Caes - A 35 mm Nikon photograph of
**Euler gamma**, made during Apollo 17, is AS17-160-23991. Euler gamma and its half-submerged crater are noticeable at the lower left part of the photograph. Research: Danny Caes - TSI = 25, CPI = 15, FI = 20; MI =60 Smith and Sanchez, 1973

## Nomenclature

- Named for Leonhard Euler (pronounced
*Oiler*) (April 15, 1707 – September 18, 1783), a pioneering Swiss mathematician and physicist, who spent most of his life in Russia and Germany. He published more papers than any other mathematician in history. Euler made important discoveries in fields as diverse as calculus and topology. He is also renowned for his work in mechanics, optics, and astronomy. - According to
*Whitaker*(p. 218), this name was introduced by Schröter. **Euler E**is calledon LTO 39-B3. Who was Firdausi? (Ferdowsi). See this Wikipedia-page.**Firdausi**- In his informal 1953 tour of Mare Imbrium, Leland Copeland referred to the group of hills and hillocks south-southwest of
**Euler**as the. Research: Danny Caes**Scattered Hills**

*Lothrop Hills - The Euler Group*

is another unofficial name for the region southwest of**Lothrop Hills****Euler**(including Mons Vinogradov). This name was printed on the greenish*Rand Mc.Nally*moonmap and on the same moonmap in Patrick Moore's*Atlas of the Universe*(1983). The origin of the nameis still a mystery (who was**Lothrop Hills****Lothrop**?). For a list of much more mysterious names on these moonmaps, see Rand McNally. Harold Hill called this region(see bibliography below). Research: Danny Caes**The Euler group**

## LPOD Articles

## Bibliography

**Euler** and environs:

- GEOLOGIE AUF DEM MOND (J.E.Guest/ R.Greeley), seite 108, abbildung 6.1. (NASA Apollo 17 - 2923).
- APOLLO OVER THE MOON; A VIEW FROM ORBIT, Chapter 4: The Maria (Part 1), Figure 65. Chapter 5: Craters (Part 3); Figure 137. (Part 4); Figures 138 and 139.

**Euler Gamma** and its half-submerged craterlet:

- APOLLO 17: PRELIMINARY SCIENCE REPORT (page 28 - 28; Lunar Orbiter photograph).
- Harold Hill.
*A Portfolio of Lunar Drawings*, page 53.