We all know that the Earth makes a complete revolution around the sun once every 365 days, following an orbit that is elliptical in shape. For a complete listing of the dates of the winter and summer solstice's and spring and fall equinox's, click here U.S. The winter solstice will occur at 3 :02 pm MST on December 21st. This year, the Northern Hemisphere summer solstice will occur at 3:43 pm MDT on June 20th. It is directly over the Tropic of Cancer, located at 23.5° north of the equator. The summer solstice marks the longest day and night of the year. In the Northern Hemisphere, it occurs when the sun is directly over the Tropic of Capricorn, which is located at 23.5° south of the equator and runs through Australia, Chile, southern Brazil, and northern South Africa. The winter solstice marks the shortest day and longest night of the year.
Therefore, on the equinox and for several days before and after the equinox, the length of day will range from about 12 hours and six and one-half minutes at the equator, to 12 hours and 8 minutes at 30 degrees latitude, to 12 hours and 16 minutes at 60 degrees latitude. Additionally, the days become a little longer at the higher latitudes (those at a distance from the equator) because it takes the sun longer to rise and set.
or a bending of the light's rays that causes the sun to appear above the horizon when the actual position of the sun is below the horizon. The "nearly" equal hours of day and night is due to refraction of sunlight. At the equator, the sun is directly overhead at noon on these two equinoxes. The word equinox is derived from two Latin words - aequus (equal) and nox (night). These events are referred to as Equinoxes and will occur on March 19th at 9:49 pm MDT (Vernal Equinox - the first day of Spring) and again on September 22nd at 7:30 am MDT (Autumnal Equinox - the first day of fall). There are only two times of the year when the Earth's axis is tilted neither toward nor away from the sun, resulting in a "nearly" equal amount of daylight and darkness at all latitudes.
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