Chennai is midway between the Equator and Tropic of Cancer.The sun is exactly overhead the equator at the equinox and then it starts moving gradually north towards the tropic of cancer passing through Chennai, it is exactly overhead at the tropic of Cancer on June 21st then it starts moving southwards towards Tropic of Capricon crossing Chennai again in the same year and is exactly overhead the Tropic of Capricon on sept 22
ahmedabad and kolkata lie on almost the same latitude
This happens at any location between the Tropic of Cancer (in the north) and the Tropic of Capricorn (in the south). These lines, about 23.4 degrees to the north and south of the equator respectively, mark the farthest latitudes away from the equator where the sun can be exactly overhead [that point is sometimes called the zenith]. This region between the tropics is known as the tropical region. If you are within the tropics but not exactly on one, you will experience the sun passing directly overhead on its way to one tropic, and then you will experience this again as the sun moves toward the other tropic. It is interesting to note that the latitudes of the tropics coincide with the earth's tilt relative to the sun-earth plane called the Ecliptic.
Twice a year
It shines directly overhead at noon on June 21-22, usually 1 or 2 days.
The sun is directly overhead at noon.
The sun reaches zenith, exactly overhead, only for locations on or between the tropics of Cancer and Capricorn. If you are right on one of the tropics, the sun will be at zenith once a year. If you are between the tropics, it will happen twice a year. Any locations in India north of the Tropic of Cancer will not see the sun reach zenith.
Twice; both during the sun's summer and winter solstices.
Twice each year.
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If you mean exactly twice, then that is Chelsea Football Club in the seasons 2004 - 2005 and 2005 - 2006.