In 1875, 17 Countries Signed the Metre Convention
A quick guide to the meter—the standard unit of length—with 4 examples of where the meter is part of day-to-day life in the USA (instead of inches, yards, and miles).
Elsewhere on timeanddate.com
May 23: Moon, Venus, and Saturn Align
Three solar system bodies will line up in the sky and be visible to the naked eye—if we can get ourselves up early enough.
Moon Guide for May
In May, the Moon aligns with Venus and Saturn. Read more about May’s Moon events and what makes this month’s Full Moon special.
AM and PM Explained
How does the 12-hour clock system work? Is midnight 12 am or 12 pm?