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A lunar day is the time it takes for Earth's Moon to complete on its axis one synodic rotation, meaning with respect to the Sun. Informally, a lunar day and a lunar night is each approx. 14 Earth days. The formal lunar day is therefore the time of a full lunar day-night cycle.
The effect is subtle to the naked eye, from night to night, yet somewhat obvious in time-lapse photography. Lunar libration causes part of the back side of the Moon to be visible to a terrestrial observer some of the time. Because of this, around 59% of the Moon's surface has been imaged from the ground.
The effect of these seasons, however, is minor compared to the difference between lunar night and lunar day. At the lunar poles, instead of usual lunar days and nights of about 15 Earth days, the Sun will be "up" for 173 days as it will be "down"; polar sunrise and sunset takes 18 days each year.
This month's full moon will also feature a lunar rarity: According to TimeandDate.com, the full moon on Dec. 15, 2024, ... It's also called the 'long night moon'
A partial lunar eclipse will also happen the same night. The 2024 harvest moon is a supermoon and features the last lunar eclipse of the year. Here's the best time to see it Tuesday night.
North America and South America will get front-row seats to the trifecta of events with a partial lunar eclipse visible Tuesday night around 10:44 p.m. ET, according to NASA.
In astronomy, a lunar fortnight is half a lunar synodic month, which is equivalent to the mean period between a full moon and a new moon (and vice versa). This is equal to 14.07 days. [3] [4] It gives rise to a lunar fortnightly tidal constituent (see: Long-period tides).
According to Lunar New Year tradition, a big cleanup should be carried out in homes on the 28th day of the last lunar month, which falls on February 7 this year.