What happens in the Southern Hemisphere when the sun crosses the equator into the northern sky? There the days grow shorter and the temperature drops. Today is in fact the southern autumnal equinox, heading towards winter. The seasons in the Southern Hemisphere are a mirror image of the ones in the north.
It’s quite clear why the vernal equinox has become known as the first day of spring, and why its equivalent when the sun moves south again on Sept. 22, the autumnal equinox, is the first day of fall.
What’s more puzzling is why the "in between" markers are known as "midwinter" and "midsummer" when we all know that they both occur rather early in their named seasons. This happens because the Earth's weather seasons actually lag a month or two behind the astronomical markers.
Anyway, enjoy the longer days and warmer weather.
- Season to Season: Earth's Equinoxes & Solstices (Infographic)
- Amazing Night Sky Photos by Stargazers (March 2013)
- How An Equinox Looks From Space | Video
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