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The "harvest moon" (also known as the "barley moon" or "full corn moon") is the full moon nearest to the autumnal equinox (22 or 23 September), occurring anytime within two weeks before or after that date. [ 17] The "hunter's moon" is the full moon following it. The names are recorded from the early 18th century. [ 18]
Various isotopes of oxygen are present on the Moon in the form of 16 O, 17 O, and 18 O. [27] At least twenty different possible processes for extracting oxygen from lunar regolith have been described, [28] [29] and all require high energy input: between 2–4 megawatt-years of energy (i.e. (6–12) × 10 13 J) to produce 1,000 tons of oxygen. [1]
The crewed Apollo missions are listed at List of missions to the Moon . Major programs encompassing several probes include: Luna program — USSR Lunar exploration (1959–1976) Ranger program — US Lunar hard-landing probes (1961–1965) Zond program — USSR Lunar exploration (1964–1970) Surveyor program — US Lunar soft-landing probe ...
The orbit of the Moon is a nearly circular ellipse about the Earth (the semimajor and semiminor axes are 384,400 km and 383,800 km, respectively: a difference of only 0.16%). The equation of the ellipse yields an eccentricity of 0.0549 and perigee and apogee distances of 362,600 km (225,300 mi) and 405,400 km (251,900 mi) respectively (a ...
A lunar phase or Moon phase is the apparent shape of the Moon 's directly sunlit portion as viewed from the Earth (because the Moon is tidally locked with the Earth, the same hemisphere is always facing the Earth). In common usage, the four major phases are the new moon, the first quarter, the full moon and the last quarter; the four minor ...
Chandra ( Sanskrit: चन्द्र, romanized : Candra, lit. 'shining' or 'moon'), also known as Soma ( Sanskrit: सोम ), is the Hindu god of the Moon, and is associated with the night, plants and vegetation. He is one of the Navagraha (nine planets of Hinduism) and Dikpala (guardians of the directions). [ 5]
At the new and full moon, the Sun and Moon are in syzygy. Their tidal forces act to reinforce each other, and the ocean both rises higher and falls lower than the average. Conversely, at the first and third quarter, the Sun and Moon are at right angles, their tidal forces counteract each other, and the tidal range is smaller than average. [5]
The Pre-Nectarian period is defined from the point at which the lunar crust formed, to the time of the Nectaris impact event. Nectaris is a multi-ring impact basin that formed on the near side of the Moon, and its ejecta blanket serves as a useful stratigraphic marker. 30 impact basins from this period are recognized, the oldest of which is the South Pole–Aitken basin.