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Equinox and Solstice. Equinox refers to a day with an equal duration of day and night. We have two equinoxes in a year which are: Spring equinox on March 21; Autumnal equinox on September 23; On the other hand, the solstice refers to a day with either the longest day or the shortest. The two solstices in a year are: Winter solstice on December ...
Find out exactly when the winter season starts. At the March equinox, the Sun crosses the equator from south to north. Explanation and 2025 equinox date. The June solstice is the longest day of the year in the Northern Hemisphere and the shortest day in the Southern Hemisphere.
Vernal equinox (about March 21): day and night of equal length, marking the start of spring. Summer solstice (June 20 or 21): longest day of the year, marking the start of summer. Autumnal equinox (about September 23): day and night of equal length, marking the start of autumn.
The March equinox happens sometime between March 19 and 21. The September equinox occurs sometime between September 21 and 24. In the Northern Hemisphere, the March equinox is also known as the spring or vernal equinox; the September equinox can be called the fall or autumnal equinox.
Jun 22, 2024 · Solstices. Date and Time for Solstices and Equinoxes. FAQs. Equinox. The equinoxes, or “equal nights,” happen twice a year: around March 20 and September 21. Equinox comes from Latin, meaning “equal night.” The two equinoxes occur in March and September; the two solstices occur in June and December.
Far right: December solstice. Diagram of the Earth's seasons as seen from the south. Far left: June solstice. The equinoxes are the only times when the solar terminator (the "edge" between night and day) is perpendicular to the equator. As a result, the northern and southern hemispheres are equally illuminated.
Aug 22, 2024 · When do the four seasons start in 2024—for spring, summer, fall, and winter? Here are the equinox and solstice dates—plus, answers to common questions about the seasons of the year in North America.
For a complete listing of the dates of the winter and summer solstices and spring and fall equinoxes through 2100, check out this site from the U.S. Naval Observatory. The Seasons. We all know that the Earth makes a complete revolution around the sun once every 365 days, following an orbit that is elliptical in shape.
Here’s a handy mnemonic device - equi means equal, and nox means night, which tells you that the day and the night are of equal length. So, at the end of the day, while solstices and equinoxes are related, they happen at different times of the year.
The Equinox in the Northern Hemisphere occurs twice a year around 20 March (the spring equinox) and around 22 September (the autumn equinox). They occur between the summer and winter solstices...
