Earth Day is observed annually on April 22.
This is a Gregorian calendar holiday — observed on the same date worldwide. There is no tithi or panchang significance to the date; it does not shift by timezone.
Earth Day is one of the festivals observed in the Hindu calendar. A detailed account of its mythology, significance, and rituals is being prepared.
Computed for Williamson (America/Phoenix) using local sunrise, sunset and astronomical positions.
Daily tithi, nakshatra, sunrise, sunset and upcoming festivals — all computed for Williamson.