What is the September Equinox or Autumnal (Fall) Equinox?

The September equinox or the autumnal or fall equinox happened on 23 September 2015. Equinoxes happen twice a year, in September and in March; equinox is when the sun shines directly on the equator and the length of the day and night is nearly equal.


The norther hemisphere enjoy the fall or the autumn season while the season on the south of the equator is opposite and it is spring season in the southern hemisphere.

Seasons are opposite on either side of the equator, hence the equinox in September is also known as the Autumnal or fall equinox and in the southern hemisphere, it is known as Spring or vernal equinox.

September equinox in Bengaluru, Karnataka was on Wednesday, September 23, 2015 at 13:52 IST.

What is the September Equinox?

What is an equinox?

Equinox is an astronomical event which caused by the tilt of Earth's axis and its orbit around the sun.

A equinox happens twice a year, when the tilt of the Earth's axis and Earth's orbit around the sun combine in a way that the axis is inclined neither towards nor away from the sun.

During such an event, the two hemispheres of the Earth receive sun's rays about equally at the time of the equinox resulting in equal duration of night and day approximately.

The equinox is derived from a Latin word aequus which means equal and nox which means night.

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