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Tribune News Network
Doha
JUNE 21 (Thursday) will be the longest day of the year with the summer solstice to start on this day and the sun to be exactly vertical on the Tropic of Cancer in northern hemisphere, Qatar Calendar House announced on Tuesday.
This phenomenon is important all over the world as summer solstice describes the tilt of the earth's axis and is also an indicator of climatic changes.
There are two reasons behind the occurrence of summer solstice including the earth's rotation on its orbit around the sun every 365.25 days approximately and earth's axis tilting over its orbit plane by 23.5 degrees.
The summer solstice will be taking place after vernal equinox which started on March 20.
June 21 will be the first day of summer solstice in the northern hemisphere where the day will be the longest, whereas southern hemisphere will witness the shortest day as it would mark the beginning of winter solstice.
The summer solstice will be followed by the sun's apparent movement towards south (earth's equator), where it will be exactly vertical on earth's equator again on autumnal equinox solstice day.
