Equinoxes, Solstices and Cross-Quarter Days 5.42

Free Trial
1.47 MB

Publisher Description

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).

Equinoxes, Solstices and Cross-Quarter Days is a free trial software application from the Astronomy subcategory, part of the Home & Hobby category. The app is currently available in English and it was last updated on 2018-02-26. The program can be installed on Win XP, Win 98, Win 2000, WinVista x32, WinVista x64, Win7 x32, Win7 x64, Win8 x32, Win8 x64, Win10 x32, Win10 x64.

Equinoxes, Solstices and Cross-Quarter Days (version 5.42) has a file size of 1.47 MB and is available for download from our website. Just click the green Download button above to start. Until now the program was downloaded 146 times. We already checked that the download link to be safe, however for your own protection we recommend that you scan the downloaded software with your antivirus.

Program Details


Publisher Hermetic Systems
Released Date 2018-02-26
Languages English


Category Home & Hobby
Subcategory Astronomy

System requirements

Operating systems windows

Download information

File size 1.47 MB
Total downloads 146


License model Free Trial
Price $14.45

Version History

Here you can find the changelog of Equinoxes, Solstices and Cross-Quarter Days since it was posted on our website on 2015-04-25. The latest version is 5.42 and it was updated on soft112.com on 2018-03-23. See below the changes in each version:

version 5.42

posted on 2018-02-26

Recompiled for Windows 10 compatibility

version 5.22

posted on 2015-12-25

Relaxed trial version restriction

version 3.33

posted on 2009-09-11

Maintenance release

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Downloads last week: 1
Release Date: 2018-02-26
Publisher: Hermetic Systems
Operating System: windows
Type: Free Trial