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The lunar phases and librations in 2019 in the Northern Hemisphere at hourly intervals, with music, titles, and supplemental graphics Simulated views of the Moon over one month, demonstrating librations in latitude and longitude. Also visible are the different phases, and the variation in visual size caused by the variable distance from Earth.
Sunrise occurs at the prime meridian when the Lunar phase reaches First Quarter, after one fourth of a lunar day. At this location the selenographic colongitude at sunrise is defined as 0°. Thus, by the time of the Full Moon the colongitude increases to 90°; at Last Quarter it is 180°, and at the New Moon the colongitude reaches 270°.
The lunar phases and librations in 2025 as viewed from the Northern Hemisphere at hourly intervals, with titles and supplemental graphics The lunar phases and librations in 2025 as viewed from the Southern Hemisphere at hourly intervals, with titles and supplemental graphics A full moon sets behind San Gorgonio Mountain in California on a midsummer's morning.
A lunar-stellar calendar, the Borana Calendar relies on astronomical observations of the moon in conjunction with seven particular stars or constellations. Borana months (Stars/Lunar Phases) are Bittottessa (), Camsa (), Bufa (), Waxabajjii (), Obora Gudda (Central Orion-Saiph), Obora Dikka (), Birra (full moon), Cikawa (gibbous moon), Sadasaa (quarter moon), Abrasa (large crescent), Ammaji ...
Timekeeping on the Moon is an issue of synchronized human activity on the Moon and contact with such. The two main differences to timekeeping on Earth are the length of a day on the Moon, being the lunar day or lunar month, observable from Earth as the lunar phases, and the rate at which time progresses, with 24 hours on the Moon being 58.7 microseconds (0.0000587 seconds) faster, [1 ...
The dark splotches that make up the large lunar maria are lava-filled impact basins that were created by asteroid impacts about four billion years ago. Though both sides of the Moon were bombarded by similarly large impactors, the near side hemisphere crust and upper mantle was hotter than that of the far side, resulting in the larger impact ...
As was discovered by Jacques Cassini in 1722, the rotational axis of the Moon precesses with the same rate as its orbital plane, but is 180° out of phase (see Cassini's Laws). Therefore, the angle between the ecliptic and the lunar equator is always 1.543°, even though the rotational axis of the Moon is not fixed with respect to the stars. [11]
Shukla Paksha refers to the bright lunar fortnight or waxing moon in the Hindu calendar. Shukla (Sanskrit: शुक्ल) is a Sanskrit word for "white" or "bright". The Shukla Paksha is a period of 15 days, which begins after the amavasya (new moon) day and culminating on purnima (full moon) day and is considered auspicious.