Same reason Ramadan and Chinese New Year change dates on the Gregorian Calendar: the dates of these things are all based on different, Lunar calendars.
Their date doesn't exactly change, what changes is the correspondence of their calendars with the Gregorian Calendar.
Same reason Ramadan and Chinese New Year change dates on the Gregorian Calendar: the dates of these things are all based on different, Lunar calendars.
Their date doesn't exactly change, what changes is the correspondence of their calendars with the Gregorian Calendar.
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Our custom is to base birthdays on Gregorian, not a lunar calendar.
For Christmas the Christians use Gregorian and for Easter they don't. Idk why