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The longest night of the year is called the Winter Solstice.

However, it is worth noting that at latitudes of higher than 66.5 degrees north or south that there may be more than one day of 24-hour darkness in a year, meaning that the night of the Winter Solstice may not be the longest night of the year, just one of the longest nights of the year. Conversely, on the equator, all days and nights are exactly 12 hours each, so technically, there is no longest night on the equator.

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Which phase of the moon has the longest duration in the night sky?

Which phase of the moon has the longest duration in the night sky?


What term has the exact opposite meaning to solstice?

"Solstice" refers to a day that has the maximum difference between day and night - either the longest day or the shortest day. The opposite would be the "equinox", which is when the day hours equal the night hours.


When is the biggest day and night?

If you mean the longest: When you have the longest day, you'll also have the shortest night, and vice versa. In the northern hemisphere, the longest day is around June 21, and the shortest day is around December 21. In the southern hemisphere, it is the other way round.


Which planet has the longest cycle of day and night?

The planet is Mercury. (Some people think it is Venus, but it is Mercury.)


How long is the longest night in the year?

That completely depends on where you are, specifically, your latitude. -- In the 'Tropics' (within 23.5° of the Equator), there are two equal longest nights of the year, but they never get any longer than about 13 hours 20 minutes. -- Outside the Tropics, the farther you are from the Equator, the longer your longest night is. (And also, the longer your longest day is.) -- Between the Tropics and the Arctic or Antarctic Circle (latitudes between 23.5° and 67.5°), the length of the longest night ranges from 13 hours 20 minutes to 24 hours. -- Between the Circles and the Poles, the longest period between sunset and sunrise is between 24 hours and nearly 6 months. At the north and south poles, it's nearly 6 months.