The Earth's shape and bending of light by the atmosphere explain the departure from expectation.
Visitors watch the sun rise at the megalithic Mnajdra Temples, a UNESCO World Heritage site outside Qrendi, Malta, that is believed to date to about 3,600 B.C. during the vernal equinox marking the beginning of spring on March 20. By David Policansky March 20 at 11:00 AM March 20 is the spring equinox. That’s when every place on Earth gets 12 hours of day and 12 of night, right?
First, let’s look at some sunrise and sunset times and day lengths for March 20, this year’s spring equinox. In Washington, D.C., sunrise is at 7:12 a.m. and sunset at 7:19 p.m. for a day length of 12 hours and 8 minutes. In Fairbanks, Alaska, the numbers are 7:51 a.m., 8:06 p.m., and 12 hours and 15 minutes.
Meanwhile, in Quito, Ecuador, almost exactly on the equator, the sun rises at 6:18 a.m. and sets at 6:24 p.m., and the day length, like every other day of the year, is 12 hours and 6 minutes.First, sunrise is defined by the appearance of the top of the sun above the horizon, while sunset is the disappearance of the top of the sun below the horizon. If the sun were a point, then it would make no difference, but the sun isn’t a point, it appears as a disk.
Thinking about these things makes me think of other aspects of sunrise and sunset. Of course, it’s the Earth that’s rotating, and making it seem as though the sun is moving. But that rotation causes the biggest environmental change we routinely see. At night, it gets dark and cool; during the day, it’s light and warmer.
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