Solstice

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. The day of the solstice is either the "longest day of the year" or the "shortest day of the year" for any place on Earth, because the length of time between sunrise and sunset on that day is the yearly maximum or minimum for that place. The name is derived from the Latin words sol (“sun”) and sistere (“to stand still”). During the solstice, the Sun stands still; that is, the seasonal movement of the Sun's path comes to a stop before reversing direction. The “Northern Solstice” occurs in June, when the sun is at its highest point seen from the North Pole. The “Southern Solstice” occurs in December, when the sun is at its highest point seen from the South Pole.

The solstices, together with the equinoxes, are connected with the seasons. In some cultures they mark either the beginning or the middle of summer and winter.

1. ↑ Équinoxe de printemps entre 1583 et 2999
2. ↑ Solstice d’été de 1583 à 2999
3. ↑ Équinoxe d’automne de 1583 à 2999
4. ↑ Solstice d’hiver
5. ↑ "A Solargraph taken from APEX at Chajnantor". European Southern Observatory. Retrieved 2011-12-25.