It also has the Vernal Equinox and Earth Day
The UN requires its members to recognize UN Day as a condition of membership.
The Vernal Equinox (and the Autumnal Equinox, and the solstices) are major lunar events and are on any calendar you will find.
Same with Earth Day, which, like all national holidays, is on the calendar.
Let me guess - your calendar doesn't have these 'fake' holidays like Martin Luther King day, Valentine's day, Easter, or your mom's birthday?
Despite the smug answer, Brick, Earth Day isn't a national holiday. In the United States, the Federal holidays are:
- New Year's Day
- Martin Luther King, Jr.'s Birthday
- Washington's Birthday
- Memorial Day
- Independence Day
- Labor Day
- Columbus Day
- Veterans Day
- Thanksgiving
- Christmas
Other states may have state holidays for Flag Day, Patriots Day, Lincoln's Birthday, Election Day, etc., etc.
Earth Day has been nationally recognized, but it's not a holiday.