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Question
What is the duration of the day on the equinox?
Short Answer
Solution
- On 21st March and 23rd September, both the poles of the earth are at the same distance from the sun.
- This condition is called the equinox.
- On the equinox, everywhere on the earth daytime and nighttime are of equal duration (12 hours each).
- On the equinox, the circle of illumination coincides with the great circle defined by two opposite meridians.
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Perihelion and Aphelion Positions of the Earth
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