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Stellar rotation is the angular motion of a star about its axis. The rate of rotation can be measured from the spectrum of the star, or by timing the movements...

Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying, light-collecting optical instrument...

The Kasei Valles are a giant system of canyons in Mare Acidalium and Lunae Palus quadrangles on Mars, centered at 24.6° north latitude and 65.0° west longitude...

Orbcomm is a family of low Earth orbit communications satellites, operated by the United States satellite communications company Orbcomm. As of July 2014[update]...

Luna 18, part of the Ye-8-5 series, was an uncrewed space mission of the Luna program. Luna 18 was placed in an Earth parking orbit after it was launched...

Equant (or punctum aequans) is a mathematical concept developed by Claudius Ptolemy in the 2nd century AD to account for the observed motion of the planets...

The following is a list of the world's largest fixed service satellite operators in the world. Comparison data is from different time periods and sources...

AZ Cancri (AZ Cnc) is a M-type flare star in the constellation Cancer. It has an apparent visual magnitude of approximately 17.59. AZ Cancri is a member...

The Southern Delta Aquariids are a meteor shower visible from mid July to mid August each year with peak activity on 28 or 29 July. The comet of origin...

The NASA Office of Inspector General (NASA OIG or OIG) is the inspector general office in the National Aeronautics and Space Administration, the space...

The Astronomical Society of Victoria (ASV) is an amateur astronomy club in the state of Victoria, Australia. It was founded in 1922, making it one of the...

Shiloh was a village in Brevard County, Florida, United States.[when?] It is the northernmost place in Brevard County. Scottsmoor also shares the title...

William George Fastie (6 December 1916 – 14 July 2000) was an American optical physicist and spectroscopist who played a part in the Johns Hopkins University...