Winter will officially begin December 21, 2025, when the winter solstice occurs at 10:03 a.m. Eastern Standard Time, according to astronomers.

Why does it occur?

The winter solstice is the moment when the Earth is tilted farthest away from the Sun. Because of this tilt, the Sun sits at its lowest point in the sky. This creates the shortest day of the year, with the least amount of daylight.

While many people think of the solstice as a full day, it’s actually just one exact moment, scientists say. That moment marks when the Earth reaches its furthest tilt from the Sun during its yearly orbit.

For many cultures, this time is seen as the true start of winter. This is known as the “astronomical winter.” But some weather experts use a different system called “meteorological winter,” which

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