Because they get midsummer twice a year and midwinter twice a year. The sun is never very far from being overhead at noon even in winter.
On the first day of Northern Hemisphere Summer, the sun is directly overhead at some point on the Tropic of Cancer ... the line around the Earth that's about 23.5° north of the equator. At every other latitude between the equator and the Tropic of Cancer ... all in the northern hemisphere ... the sun is directly overhead twice, on two different days between March 21 and September 21, with June 21 exactly between them. How far the two days are on either side of June 21 depends on the latitude. Right ON the equator, they're March 21 and September 21.
Yes. Most places in the Hawaiian Islands will experience the noon Sun "straight overhead" twice each year. In fact, the phrase "Lahaina Noon" is sometimes used in the Islands to refer to those days on which the Sun reaches the zenith.
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Murder Twice Told was created in 1950.
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
The same will happen for any location that is less than 23.5 degrees from the equator.
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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