| About Autumnal equinox |
| An Equinox occurs twice a year, around March 20/21 and September 22/23. The name “equinox” is derived from the ati ‘qequus’ and ‘nox’. When the tilt of the Earth’s axis is included neither away form nor towards the Sun, an Equinox occurs. Around the equinox, the night and day are approximately equally long. The same event is happening on other planets. 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: the vernal point and the autumnal point. Autumnal Equinox Day is a national holiday in Japan occurs on September 23 or 24. It is not only marking the changing of seasons but also to pay our respect to our deceased parents, grand parents and other family members. There are three months considered as autumn months namely September, October, and November. On this day, the sun rises exactly in the east and sets exactly in the west, and day and night become the same length. The Japanese have traditionally called the period around the autumnal and vernal (springtime) equinoxes higan. Higan lasts for seven days: beginning three days prior to the equinox and ending three days after it. |
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