ancient skywatchers regulated their calendars and tracked days with celestial alignments, often sunrises and sunsets with targetted shadow and light features on equinoxes, solstices or cross quarters
 

earth's position relative to seasonal cusps

   
vernal equinox imbolc
Lughnasad autumnal equinox
   
 
               
 
Time, time zone, date & year automatically load from your computer's settings for any of 4 major North American time zones, otherwise defaults to Universal Time. Time display can be reset to any of the 5 zones by using the adjacent pull down menu. Hour display will adjust for Daylight Saving or Standard Time when date-appropriate. When the date and/or year is reset with the refresh button, all Cross Quarter, Solstice and Equinox times are displayed for the chosen year. Any date chosen in the first two decades of the 21st century displays the earth's position relative to its seasonal cusps.
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