To all my Muslim friends, Eid Mubarak!

Yes, today is a holiday in the Islamic world - Eid al-Fitr - signaling the end of Ramadan, the Islamic holy month of fasting.

The day varies from year-to-year on the Gregorian calendar, as the Islamic calendar is lunar and the Gregorian calendar is solar.

That means that each year the holidays gets bumped up a week and a half, which in the coming few years is going to make Ramadan fasting pretty rough in the Middle East.

This year Ramadan started on the first of September, but next year it starts in the middle of August.

No water until sunset in late August in the Middle East? Yikes.

Anyway, Happy Eid.