Disk Clock takes the idea of clock and turns it inside-out by moving the faces instead of the hand. The Solar Year Disk beautifully presents the turn of the seasons.
Note that because this is a solar year, it turns at an even rate, and months are approximate. Solstices and Equinoxes are positioned at calculated positions (not simple quadrants), but are approximate. Light and dark show rough proportion of daylight throughout the year.
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Version 2.6 improves the solstice/equinox dates for Disk Calendar as well, and limits the scaling of the options pages, which behaved poorly at large sizes.