Thursday, September 22, 2011

The Autumnal Equinox: September 23, 2011

The sun will transit the celestial equator September 23, 2011 at approximately 09:04 UT, making the sun transit southward in the northern hemisphere: the start of the autumnal equinox. Derived from the Latin, 'equinox' literally means (aequus + nox) equal night, equinox describes the equality of the night and day, which should be about the same. At this equinox, the sun is at the southern point on the celestial sphere where the celestial equator, at declination zero, and the ecliptic simultaneously intersect. Seasons movie.