When the earth tilts and causes the sun to be overhead at the equator, the scenario is referred to as an equinox. This takes place two times per year. On either the 20th or 21st day of March annually, the spring or vernal equinox takes place. On the other hand, on either 22nd or 23rd day of September every year, the fall or autumnal equinox occurs. During each of the equinoxes mentioned above, the lengths of day and night are roughly equal bearing in mind that the sun is directly overhead along the equator.
During the summer equinox, a lot of solar energy reaches the earth’s surface compared to either the spring or fall equinox. However, the longest daylight time is experienced on either the 21st or 22nd day of June annually. This is the same time when the summer solstice takes place. The first summer day is also marked on one of the dates above. On either the 21st or 22nd day of December, the winter solstice takes place. It is also the season characterized by the shortest time during the day.
One of the parallels of latitudes is the Antarctic Circle. It is used to mark the global map. Its latitudinal position south of the equator is 66.5622° (degrees).
The Arctic Circle is positioned north of the equator, and its latitudinal mark is 66.5622° (degrees). It serves the same function as the Antarctic Circle. On the 21st Day of December, the North Pole usually tilts far from the sun. On the same date, the Arctic Circle towards the extreme northern position experiences twenty-four hours of darkness. On the 21st day of June, the North Pole is inched closer to the sun.
The Tropic of Cancer (23.5 degrees north of the equator) is used to indicate the point which is extremely northerly and where the sun can be viewed as already explained. In contrast, the southern tropic is also referred to as the Tropic of Capricorn.