Equinoxes occur twice a year, in March and September, to mark the onset of spring and autumn. During an equinox, which in Latin translates to “equal night,” both day and night are equal.

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The spring — or vernal — equinox can land on March 19, 20 or 21, depending on the year. This year it landed on Monday at 5:24 p.m. Eastern time.

The Spring Equinox marks the start of longer days and renewal, celebrated across cultures for balance, growth, and the natural rhythms of life.

The Northern Hemisphere’s spring — or vernal — equinox can land between March 19 and 21, depending on the year. Its fall – or autumnal — equinox can land between Sept. 21 and 24.

But on March 19, the astronomical winter ends and spring begins. It's also known as the vernal equinox – when day and night are the about same length almost everywhere on Earth.

After windy conditions on Wednesday, the first day of spring is forecast to be sunny with a high near 65. Here's what to know about the season's change.

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