Today I Learn… I make a point of learning something new everyday. This is what I learn each day

1, Mar 20, 2013

March 20, 2013 Spring equinox day

Filed under: Learning — admin @ 7:49 am

equinox day March 20

This is from a friend of mine who nicely reminds me of the equinox.

According to wikipedia, “An equinox occurs twice a year (around 20 March and 22 September), when the tilt of the Earth’s axis is inclined neither away from nor towards the Sun, the center of the Sun being in the same plane as the Earth’s equator. The term equinox can also be used in a broader sense, meaning the date when such a passage happens. The name “equinox” is derived from the Latin aequus (equal) and nox (night), because around the equinox, night and day are about equal length.

At an equinox the Sun is at one of two opposite points on the celestial sphere where the celestial equator (i.e. declination 0) and ecliptic intersect. These points of intersection are called equinoctial points: classically, the vernal point (RA = 00h 00m 00s and longitude = 0º) and the autumnal point (RA = 12h 00m 00s and longitude = 180º). By extension, the term equinox may denote an equinoctial point.”

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