lunation - определение. Что такое lunation
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Что (кто) такое lunation - определение

PHASE OF THE MOON
New Moon; New moon/details; Lunar conjunction; Moonless; Old Moon; Lunation Number; New moons; Newmoon; 🌚; 🌑; Lunation Cycle; New Moon day; No moon night
  • Earth's orbital plane]]) results in the revolution of the [[lunar nodes]] relative to the Earth. This causes an [[eclipse season]] approximately every six months, in which a [[solar eclipse]] can occur at the new moon phase.
  • Planetlight]], [[zodiacal light]], and [[starlight]] contribute a negligible amount of the total light that the lunar surface reflects.}}

lunation         
UNITS OF TIME BASED ON THE MOON
Synodic month; Draconic month; Anomalistic month; Sidereal month; Lunar Month; Lunation; Synodic Month; Tropical month; Moon month; Lunar months; Astronomical month
[lu:'ne??(?)n]
¦ noun Astronomy another term for lunar month.
Origin
ME: from med. L. lunatio(n-), from L. luna 'moon'.
Lunation         
UNITS OF TIME BASED ON THE MOON
Synodic month; Draconic month; Anomalistic month; Sidereal month; Lunar Month; Lunation; Synodic Month; Tropical month; Moon month; Lunar months; Astronomical month
·noun The period of a synodic revolution of the moon, or the time from one new moon to the next; varying in length, at different times, from about 29/ to 29/ days, the average length being 29d., 12h., 44m., 2.9s.
synodic month         
UNITS OF TIME BASED ON THE MOON
Synodic month; Draconic month; Anomalistic month; Sidereal month; Lunar Month; Lunation; Synodic Month; Tropical month; Moon month; Lunar months; Astronomical month
¦ noun Astronomy another term for lunar month.

Википедия

New moon

In astronomy, the new moon is the first lunar phase, when the Moon and Sun have the same ecliptic longitude. At this phase, the lunar disk is not visible to the naked eye, except when it is silhouetted against the Sun during a solar eclipse.

The original meaning of the term 'new moon', which is still sometimes used in calendrical, non-astronomical contexts, is the first visible crescent of the Moon after conjunction with the Sun. This thin waxing crescent is briefly and faintly visible as the Moon gets lower in the western sky after sunset. The precise time and even the date of the appearance of the new moon by this definition will be influenced by the geographical location of the observer. The first crescent marks the beginning of the month in the Islamic calendar and in some lunisolar calendars such as the Hebrew calendar. In the Chinese calendar, the beginning of the month is marked by the last visible crescent of a waning Moon.

The astronomical new moon occurs by definition at the moment of conjunction in ecliptical longitude with the Sun when the Moon is invisible from the Earth. This moment is unique and does not depend on location, and in certain circumstances, it coincides with a solar eclipse.

A lunation, or synodic month, is the time period from one new moon to the next. At the J2000.0 epoch, the average length of a lunation is 29.53059 days (or 29 days, 12 hours, 44 minutes, and 3 seconds). However, the length of any one synodic month can vary from 29.26 to 29.80 days (12.96 hours) due to the perturbing effects of the Sun's gravity on the Moon's eccentric orbit.