A solstice is the time when the Sun reaches its most northerly or southerly excursion relative to the celestial equator on the celestial sphere. Two solstices occur annually, around 20–22 June and 20–22 December. In many countries, the seasons of the year are defined by reference to the solstices and the equinoxes.

Solstice, either of the two moments in the year when the Sun’s apparent path is farthest north or south from Earth’s Equator. In the Northern Hemisphere the summer solstice occurs on June 20 or 21 and the winter solstice on December 21 or 22.

2025年3月11日 · Equinoxes and solstices are a result of two things: Earth’s tilt and its orbit around the Sun. Earth, like nearly all the planets, orbits the Sun in a tilted fashion. Earth spins once a day on its axis of rotation, an imaginary line running through the North and South Poles.

The meaning of SOLSTICE is either of the two points on the ecliptic at which its distance from the celestial equator is greatest and which is reached by the sun each year about June 21 and December 21.

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; Winter solstice (December 21 or 22): shortest day of the year, marking the start of winter

The summer solstice is the day with the longest period of daylight and shortest night of the year in that hemisphere, when the sun is at its highest position in the sky. At either pole there is continuous daylight at the time of its summer solstice.

2017年8月10日 · The summer solstice falls between June 20 and 22 in the Northern Hemisphere. The longest day of the year, it has inspired celebrations for millennia.

2024年3月12日 · A solstice is an event in which a planet ’s poles are most extremely inclined toward or away from the star it orbits. On our planet, solstices are defined by solar declination —the latitude of Earth where the sun is directly overhead at noon.

2024年5月17日 · What is the summer solstice, and when does it happen? The longest day of the year falls on either June 20 or 21 every year in the Northern Hemisphere. Here's everything you need to know about the...

A solstice is an astronomical event that happens twice each year when the Sun reaches its highest position in the sky as seen from the North or South Pole.