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Thats the equinoxes, halfway between longest and shortest days, happens twice a year: Once in the spring and once in the autumn
March 20 and September 23 are the two equinox days when there are 12 hours of daylight and 12 hours of darkness at any place on the Earth.
One day is equal to 24 hours therefore 3.5 days is equal to 84 hours.
Two days equal 48 hours.
144 hours is equal to 6 (six) days.
March 20th or 21st
It depends on where you are Not Really, If you live on the Equator, Every 24 hour period has 12 hours of daylight, and twelve hours of darkness. For every one else, there are only two 24 hour periods during the year When daylight hours equal night hours. These two days are the Vernal and Autumnal Equinox. (Equinox means equal). If you account for the differences in the number of daylight and dark hours in a 24 hour period, over an entire year, the average is 4380 hours each for daylight and darkness.
Thats the equinoxes, halfway between longest and shortest days, happens twice a year: Once in the spring and once in the autumn
March equinox and September equinox : Daylight and darkness are of equal length on both the Vernal Point (Spring/March 20th 2011) and the Autumnal Point (Autumn/September 23rd 2011) .
No. At an equinox, which happens in March and September, the amount of daylight and darkness are about equal.
These are the spring and autumn equinoxes, and are days when the daylight and darkness are equal.
March 20 and September 23 are the two equinox days when there are 12 hours of daylight and 12 hours of darkness at any place on the Earth.
Only on the 2 equinox's which are March 21 and September 21.
21 April and 21 September.
They're the same length on either side of the date of the equinox, which falls in March and September. In 2009 those dates were 3/20 and 9/22, respectively. Just count days on either side of those dates, to answer our question. What ends up happening, is that the first 20 days of March will have roughly the same length of daylight as the 20 days AFTER the September equinox (i.e. 9/22 thru 10/11). Similarly, the first twenty days of September will have the quality of daylight shown for the first 20 days after the spring equinox (3/20 thru 4/9)
In terms of daylight and darkness, that will depend on where in the world you are. If you are in the Antarctic, then it is bright all of the time, with no darkness, in January and completely dark with almost no light in July. It would be the reverse in the Arctic. If you were on the equator, it would be about 12 hours of light and 12 hours of darkness all year. Between the equator and the poles, the amount of darkness and daylight will vary, getting more extreme the closer to the poles you get.
There are 1407.5 hours of daylight on Mercury which is 56.646 earth days!!