The Calendar
What the atlas records for this date, across the traditions it covers.
Observed On This Date
Veneration of a deity or holy figure
15 September
Nativity / birth remembered
12 Rabi al-Awwal; 17 Rabi al-Awwal in most Twelver Shii practice
Sunni reckoning. Many Shia communities keep it on Rabi al-Awwal 17.
Dates for the Hebrew and Islamic calendars are the tabular reckoning, which is what a printed calendar prints. Communities that begin a month on a sighted crescent may differ by a day, and differ from one another by place.