I suspect the methods in the book in the first question were not used for this purpose. the Sept 2020 equinox). For example, if you live in Cape Canaveral, Fla., your latitude is 28 24' 21" N, or approximately 28.4 degrees. They were coded in JavaScript and built into this web page by the web page author, Ken The equinoxes mark the times when the sun passes directly above the equator. Note that there is no year 0 BC; the day before 1 Jan 1 AD is 31 Dec 1 BC. timeanddate.com/date/perfect-calendar.html, https://github.com/barrycarter/bcapps/blob/master/STACK/bc-solve-astro-13008.c, http://aa.usno.navy.mil/faq/docs/SpringPhenom.php, https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/FORTRAN/req/time.html#Ephemeris%20Time%20(ET), https://en.wikipedia.org/wiki/Julian_calendar, https://en.wikipedia.org/wiki/History_of_calendars#Prehistory, http://hpiers.obspm.fr/eop-pc/models/constants.html. Are there accurate equinox and solstice predictions for the distant past? Does it account for Daylight Saving Time (DST)? For a complete listing of the dates of the winter and summer solstices and spring and fall equinoxes through 2025, check out this site from the U.S. weren't even using calendars regularly at the time: quoting This year's spring equinox is the earliest since 1896. Time corrections outside this range are There are different expressions for each solstice or equinox, and different expressions for the year ranges -1000 to 1000 vs. 1000 to 3000. between vernal equinoxes is slightly less (365.242190402 If the Full Moon is on a Sunday, Easter is celebrated on the following Sunday. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A solstice is an event that occurs when the Sun appears to reach its most northerly or southerly excursion relative to the celestial equator on the celestial sphere. Therefore, on the equinox and for several days before and after the equinox, the length of day will range from about 12 hours and six and one-half minutes at the equator, to 12 hours and 8 minutes at 30 degrees latitude, to 12 hours and 16 minutes at 60 degrees latitude. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site.

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