Source: The Internet Encyclopedia of Science
The Sun crosses the Equator in a few days' time on its southward journey. September 23rd to be precise. Actually, to be strictly correct, the Sun doesn't cross the Equator. It's more like the Earth reaching a portion of her orbit around the Sun such that parts of the Earth's surface around the Equatorial region would face the Sun directly at noon on September 23rd. Those who spoke Latin named this day Equinox, from aequus (equal), nox (night), meaning there would be equal number of day and night hours in a single day.
In another three months the Chinese will be celebrating the end of another year. They call that winter solstice in the northern hemisphere. Longer nights ahead.
Of course, things are reversed in the southern hemisphere.
On a more practical side, it also means that the sun will no longer shine directly into my living room. Cooler daytime temperatures are definitely welcomed.
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