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Detailed explanation-1: -This means that the first day of Spring, or the Vernal Equinox, is the day the planet balances on its axis before one hemisphere begins to tilt toward the sun.

Detailed explanation-2: -More specifically, the start of each season is marked by either a solstice (for winter and summer) or an equinox (for spring and autumn). A solstice is when the Sun reaches the most southerly or northerly point in the sky, while an equinox is when the Sun passes over Earth’s equator.

Detailed explanation-3: -The autumnal equinox, usually occurring on September 22 or 23, means fall is officially here. The autumnal equinox is one of only two days-the other is the spring, or vernal, equinox-when the Sun is directly above the Equator, ostensibly dividing night and day into equal portions.

Detailed explanation-4: -In the Northern Hemisphere, the March equinox is called the vernal or spring equinox while the September equinox is called the autumnal or fall equinox. In the Southern Hemisphere, the reverse is true.