What’s the longest day of the year: On Tuesday we will big day in year witness the summer solstice or June solstice, which is the longest day of the year in the northern hemisphere and the shortest day in the southern hemisphere. The June solstice also marks the beginning of the summer season in the Northern Hemisphere and the winter season in the Southern Hemisphere. For those in North America, this astronomical event occurs on June 20 at 10:32 pm. CDT (UTC-5) while otherwise it usually occurs on June 21, 2021 at 03:32 UTC.
This year, the June solstice is expected to fall on Tuesday, June 21, 2022 at 9:14 UTC (4:14 A.M.CDT) and is caused by the tilt of the Earth on its axis and its movement big day in year in orbit around the Sun.
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Why are the days longer in the northern hemisphere and shorter in the southern hemisphere?
On the day of the June solstice, the north pole is tilted more directly towards the sun and the longest day of the year this year south pole is tilted more directly away from the sun. Therefore, the days are longer in the Northern Hemisphere and shorter in the Southern Hemisphere.
Interesting facts:
The word “solstice” comes from the Latin words “sol” (which means sun) and “sistere” (which means stationary). It happens twice a year. In the Northern Hemisphere it occurs in June and in the Southern Hemisphere it occurs in December.
A few thousand years ago the solstice occurred when the sun was in the constellation of Cancer (from the Latin crab) and so was called the line of latitude, Tropic of Cancer.
At the June solstice, the sun reaches its northernmost position. Reaches the Tropic of Cancer, the longest day of the year and pauses before changing direction and moving south again.
During the summer solstice, midsummer night parties are organize in Sweden, Denmark, Norway and Finland.
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According to the current Earth orbit, the date of the summer solstice rotates between the longest day of the year 20, 21 and 22 June and is not fix as it depends on physics our solar system and not on the human calendar.
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Why Does the Date Vary?
The date of the equinoxes and solstices varies because a year in our calendar does not exactly coincide. Longest day this year With the length of the tropical year, long day in year the time it takes for the Earth to complete one orbit around the Sun.
Today’s Gregorian calendar has 365 days in a common year and 366 days in a leap year. However, it takes our planet approximately 365.242199 days to orbit the Sun. This means that the time of the equinoxes and solstices slowly moves away from the Gregorian calendar. With the solstice occurring approximately 6 hours later each year. Eventually, the backlog becomes so great that it falls on the next date. To realign the calendar with the tropical year, (almost) a leap day is introduce every four years. When this happens, the dates of the equinox and solstice revert to the previous date.
Other factors affecting the timing of the equinoxes and solstices include variations in the length of a tropical year. Long day in year And in the Earth’s daily orbital and rotational motion, such as “wobble” in the Earth’s axis (precession).
