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Equinoxes, Solstices and Cross-Quarter Days

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Hermetic Systems
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Equinoxes, Solstices and Cross-Quarter Days 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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Equinoxes, Solstices and Cross-Quarter Days
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supported os's
Windows
    Windows 98
    Windows Me
    Windows NT
    Windows 2000
    Windows XP
    Windows 2003
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downloads 101
version 3.11
size in Kb 1,415
popularity   
3611/1272475
user rating 5/10
our rating 0 Stars
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