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The Persian calendar begins each year at the northward equinox, observationally determined at Tehran. [15] The Indian national calendar starts the year on the day next to the vernal equinox on 22 March (21 March in leap years) with a 30-day month (31 days in leap years), then has 5 months of 31 days followed by 6 months of 30 days. [15]
The Latinate names estival solstice (summer) and hibernal solstice (winter) are sometimes used to the same effect, [17] as are midsummer and midwinter. June solstice and December solstice refer to the months of year in which they take place, [ 18 ] with no ambiguity as to which hemisphere is the context.
In the Northern Hemisphere, the March equinox is called the vernal or spring equinox while the September equinox is called the autumnal or fall equinox. In the Southern Hemisphere, the reverse is true. During the year, equinoxes alternate with solstices. Leap years and other factors cause the dates of both events to vary slightly. [12]
The winter solstice is the shortest day of the year, marking the period with the fewest hours of daylight. It also represents the longest night of the year, and the time when the sun is at its ...
The summer solstice marks the official start of the astronomical summer and also has the longest amount of sunlight of any day. The longest day of the year is today. Here’s what the summer ...
Winter solstice, the shortest day of the year and the official first day of winter, is on Thursday, December 21, this year (well, for the vast bulk of the Americas anyway).
The summer solstice is the day with the longest period of daylight and shortest night of the year in that hemisphere, when the sun is at its highest position in the sky. At either pole there is continuous daylight at the time of its summer solstice. The opposite event is the winter solstice. The summer solstice occurs during the hemisphere's ...
The winter solstice marks the shortest day and longest night of the year, according to the National Weather Service. This occurs due to the Earth's tilt from the sun.