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Does day length change at the equator?

How much does the length of a day change throughout the year at the equator?

  • Answer:

    Singapore is 1 degree North of the equator. On the shortest day of the year, December 21st (Winter Solstice), the length of a day is 12h 03m 02s.  On the longest day of the year, June 21st (Summer Solstice), the length of a day is 12h 11m 48s. So the length of a day changed in Singapore by about 9 minutes.  More directly on the equator, the delta would be even smaller.  So the answer is, not much. You can calculate the hours of daylight here: http://www.timeanddate.com/worldclock/astronomy.html?n=236&month=6&year=2013&obj=sun&afl=-11&day=1

Richard Clayton at Quora Visit the source

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A full day at a point exactly on the equator is about 24 hours and 28 seconds at the end of December and about 23 hours and 40 seconds at the end of March and the end of September (the exact dates vary a little.)  Look at http://en.wikipedia.org/wiki/Equation_of_time and read very carefully (you'll be taking the derivative of the two-component curve shown there.)

James G Bridgeman

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