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Equinoxes, Solstices and Cross-Quarter Days
Calculate dates and times for equinoxes, solstices and Celtic cross-quarter days....
calculate days quarter wave plate simulation quarter quarter note quarter rest
Julian-Gregorian-Dee Date Calculator
Convert Julian, Gregorian, and Dee calendar dates and do date arithmetic....
calendar date Gregorian Chant notation Jalaali to Gregorian Convert Gregorian Date