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Equinoxes, Solstices and Cross-Quarter Days 3.44

Calculates dates and times for equinoxes, solstices and cross-quarter days.

Developer:
Hermetic Systems
License:
Shareware
OS:
Windows 98 / ME / 2000 / XP / 2003 / Vista
Requirements:
Screen resolution of at least 1024x768.
Price:
$9.95
Price is subject to change at any time by the company
Date added:
11/9/2009
Last Update:
3/20/2009
User Rating:
Not yet rated.
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Download free trial ( Free Trial | 1.55 MB ) Purchase full license ( Full Version | $9.95 / €6.69 )
Equinoxes, Solstices and Cross-Quarter Days 3.44 Publisher's 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).
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