Things I didn't know, knowledge is power

Today is the first day of the Islamic new year.
The Islamic calendar is 11 to 12 days shorter than our Gregorian calendar year. Because the year has varying lengths it does not correspond with the same day every year on the Gregorian calendar.
This year the first day of the Islamic New Year is December 7, next year it will be November 26.
The first month of the Islamic calendar is Muharram. The Islamic calendar also has 12 months as does the Gregorian calendar.