March 20 is the 79th day of the year in the Gregorian calendar, with 286 days remaining until the end of the year. It often marks the arrival of spring in the Northern Hemisphere, coinciding with the vernal equinox, when day and night are approximately equal in length. In addition to its seasonal significance, March 20 is recognized for various observances, including International Day of Happiness, which promotes the importance of happiness in people's lives. It is also the birthday of notable figures such as Johann Sebastian Bach and Spike Lee, contributing to its cultural relevance.