Lilius (crater)

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Lilius
Lilius crater 4119 h1.jpg
Coordinates 54°30′S6°12′E / 54.5°S 6.2°E / -54.5; 6.2 Coordinates: 54°30′S6°12′E / 54.5°S 6.2°E / -54.5; 6.2
Diameter 61 km
Depth 3.0 km
Colongitude 354° at sunrise
Eponym Aloysius Lilius

Lilius is a lunar impact crater that is located in the rugged southern highlands of the Moon. It lies to the north of the crater Zach, and south-southwest of Cuvier. Just to the southeast is the slightly larger Jacobi. The crater is named after the inventor of the Gregorian calendar, Aloysius Lilius.

Lunar craters

Lunar craters are impact craters on Earth's Moon. The Moon's surface has many craters, almost all of which were formed by impacts.

Impact crater Circular depression on a solid astronomical body formed by a hypervelocity impact of a smaller object

An impact crater is an approximately circular depression in the surface of a planet, moon, or other solid body in the Solar System or elsewhere, formed by the hypervelocity impact of a smaller body. In contrast to volcanic craters, which result from explosion or internal collapse, impact craters typically have raised rims and floors that are lower in elevation than the surrounding terrain. Impact craters range from small, simple, bowl-shaped depressions to large, complex, multi-ringed impact basins. Meteor Crater is a well-known example of a small impact crater on Earth.

Moon Earths natural satellite

Earth's Moon is an astronomical body that orbits the planet and acts as its only permanent natural satellite. It is the fifth-largest satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits. The Moon is, after Jupiter's satellite Io, the second-densest satellite in the Solar System among those whose densities are known.

The outer rim of Lilius has been worn down and rounded, particularly to the northwest where the inner wall protrudes farther into the interior floor. The lowest portion of the rim is to the south, adjacent to a crater attached to the southeast part of the outer wall. The interior floor is relatively flat and featureless, but there is a wide, domed central peak at the midpoint.

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 Lilius.

LiliusLatitudeLongitudeDiameter
A55.4° S8.8° E41 km
B53.0° S3.8° E29 km
C54.4° S3.3° E40 km
D50.6° S3.0° E51 km
E50.1° S2.9° E38 km
F49.4° S1.7° E43 km
G50.0° S0.7° E7 km
H50.5° S0.8° E9 km
J56.3° S1.8° E13 km
K53.6° S2.2° E23 km
L54.9° S2.5° E6 km
M56.2° S2.9° E11 km
N49.0° S2.8° E5 km
O55.4° S3.6° E7 km
P55.9° S3.9° E4 km
R54.6° S4.4° E9 km
S52.8° S5.9° E14 km
T55.9° S7.5° E5 km
U53.5° S7.6° E8 km
W53.6° S8.3° E9 km
X53.5° S9.9° E4 km

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References

Ewen Whitaker British astronomer

Ewen Adair Whitaker was a British-born astronomer who specialized in lunar studies. During World War II he was engaged in quality control for the lead sheathing of hollow cables strung under the English Channel as part of the "Pipe Line Under The Ocean" Project (PLUTO) to supply gasoline to Allied military vehicles in France. After the war, he obtained a position at the Royal Greenwich Observatory working on the UV spectra of stars, but became interested in lunar studies. As a sideline, Whitaker drew and published the first accurate chart of the South Polar area of the Moon in 1954, and served as director of the Lunar Section of the British Astronomical Association.

NASA space-related agency of the United States government

The National Aeronautics and Space Administration is an independent agency of the United States Federal Government responsible for the civilian space program, as well as aeronautics and aerospace research.

United States Geological Survey Scientific agency of the United States government

The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility.