Southern California Winter Solstice Tuesday December 21 2021.
Griffith Park Observatory Live Virtual Winter Solstice Observation is Tuesday December 21 2021.
Griffith Observatory Explains Winter Solstice
The Winter Solstice is the astronomical end of fall, and the start of winter.
The winter solstice is the day when the Sun at solar noon is the lowest in the sky and the time from sunrise to sunset is the shortest for the year.
Winter begins in Earth’s northern hemisphere at 7:59am PST on December 21.
Summer begins in the southern hemisphere at the same time. The December/winter solstice occurs when the Sun reaches its minimum declination (-23.5 degrees).
This is when the northern hemisphere of Earth is tilted as far away from the Sun as possible during a given year.
From the autumnal equinox until the start of winter – the winter solstice in December – days become shorter, and the local noon elevation of the Sun decreases.
This happens because the Earth’s axis is tilted 23½ degrees to its orbit. December 21 is the shortest day of the year.
Griffith Observatory marks the start of winter in the northern hemisphere with a live online talk (weather permitting) focused on the Sun as it reaches its lowest point in the sky at local noon.
Observatory staff will discuss the meaning of local noon and show how the Sun’s changing path across the sky causes seasonal changes.
Griffith Observatory marks the start of winter in the northern hemisphere with a live online talk (weather permitting) focused on the setting Sun.
Observatory staff will discuss how the Sun’s changing path across the sky causes seasonal changes and determines where the Sun sets on the western horizon.
Griffith Observatory Winter Solstice YouTube Viewing Event
Watch Live on Tuesday December 21 2021 at 11:00am and at 4:30pm
Watch Live and Archived Lunar Activity On Griffith Observatory YouTube Channel