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The date and time of this astronomical event varies year-to-year, but typically occurs either on the 21st or 22nd of December. The 2023 winter solstice falls on Dec. 21 at 10:27 p.m. Eastern Time.
Astronomical almanacs define the solstices as the moments when the Sun passes through the solstitial colure, i.e. the times when the apparent geocentric celestial longitude of the Sun is equal to 90° (June solstice) or 270° (December solstice). [29] The dates of the solstice varies each year and may occur a day earlier or later depending on ...
When does winter start? In 2023, the winter solstice date is Thursday, December 21. So, what is the winter solstice, and why does it happen?
The winter solstice occurs during the hemisphere's winter. In the Northern Hemisphere, this is the December solstice (December 21 or 22) and in the Southern Hemisphere, this is the June solstice (June 20 or 21). Although the winter solstice itself lasts only a moment, the term also refers to the day on which it occurs.
Front right: summer solstice for the Southern Hemisphere. Although the summer solstice is the longest day of the year for that hemisphere, the dates of earliest sunrise and latest sunset vary by a few days. [8] This is because Earth orbits the Sun in an ellipse, and its orbital speed varies slightly during the year. [7]
The winter solstice marks the first day of winter, ushering in the colder weather and holiday season. But daylight saving isn't to blame; the Earth's tilt is. But daylight saving isn't to blame ...
The December-solstice solar year is the solar year based on the December solstice. It is thus the length of time between adjacent December solstices. The length of the December-solstice year has been relatively stable between 6000 BC and AD 2000, in the range of 49 minutes 30 seconds to 50 minutes in excess of 365 days 5 hours.
The summer solstice marks the first day of the summer season. In the northern hemisphere, the 2023 summer solstice begins on Wednesday, June 21.