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How to Calculate the Equinox

The equinox happens twice a year and refers to the exact time when the sun crosses the celestial equator, causing day and night to be of equal length. It's also the moment that marks the beginning of spring and the start of fall. Several online sites help you to calculate that precise date and time.

Instructions

- 1
  Use the equinox calculator at http://stellafane.org/misc/equinox.html. It calculates both annual equinoxes as far back as the year 1000 and as far out as 3000. Type in the year and click on "Calculate" to see the result displayed in your local time and GMT.
- 2
  Refer to the seasons calculator at http://www.timeanddate.com/calendar/seasons.html. The calculator is in fact a list of the annual equinoxes and solstices between 2000 and 2049. To find the equinoxes, look at the columns under March and September.
- 3
  Visit the website of Romsey, a village in south Australia. It provides a solstice and equinox calculator at http://home.iprimus.com.au/foo7/equinox.html. Simply enter a year between 1000 and 3000 in the box provided and click on the blue button labeled "Calculate."

Astrology