In the early Roman calendar, April was the second month but became fourth when they started to use January as the first month. The origin of it was Aprilis, meaning 'to open'. In April, small animals that were hibernating usually come out and the birds fly back northward to settle, bees and butterflies begin to gather nectar. In some parts of the world, April is planting time but in other parts, it's the harvest season.
Twice a year day and night fall into balance, lasting for nearly equal lengths. Known as equinoxes, Latin for “equal night,” they occur in March and September and along with solstices, mark the changing of seasons as Earth travels around the sun.