About Equinoxes, Solstices and Cross-Quarter Days
Software to calculate accurate dates and times for equinoxes, solstices and the Celtic cross-quarter days. The cross-quarter days are those midway between the equinoxes and solstices.
This software calculates accurate dates and times for equinoxes, solstices and the Celtic cross-quarter days (Imbolc, Beltane, Lughnassad and Samhain). The cross-quarter days are those midway between the equinoxes and solstices. For example, Imbolc is midway between the northern winter solstice and the northern spring equinox (a.k.a. the northern vernal equinox), and Beltane is midway between the northern spring equinox and the northern summer solstice. When we attempt to define the cross-quarter days more exactly we find that there are two interpretations, and thus two methods of calculation, which give slightly different results. These two methods are called the 'mean sun' method and the 'true sun' method. The mean sun method assumes (erroneously) that the Earth moves at a constant speed in a circular orbit around the Sun. The true sun method calculates a cross-quarter day based on the time at which the Earth reaches that point in its orbit which is spatially (geometrically) exactly halfway between its positions at the solstice (or equinox) and the subsequent equinox (or solstice).
Previous Versions
Here you can find the changelog of Equinoxes, Solstices and Cross-Quarter Days since it was posted on our website on 2015-04-25 03:00:00.
The latest version is 6.27 and it was updated on 2024-04-23 08:36:54. See below the changes in each version.
Equinoxes, Solstices and Cross-Quarter Days version 6.27
Updated At: 2021-11-14
Equinoxes, Solstices and Cross-Quarter Days version 6.17
Updated At: 2019-12-23
Changes: Change to trial version
Equinoxes, Solstices and Cross-Quarter Days version 5.42
Updated At: 2018-02-26
Changes: Recompiled for Windows 10 compatibility
Equinoxes, Solstices and Cross-Quarter Days version 5.22
Updated At: 2015-12-25
Changes: Relaxed trial version restriction
Equinoxes, Solstices and Cross-Quarter Days version 3.33
Updated At: 2009-09-11
Changes: Maintenance release
Disclaimer
External Download
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