Why is the Solstice Celebrated at Astara
The December solstice takes place around December 21. On this day, the Sun is precisely over the Tropic of Capricorn.
In the Northern Hemisphere, December 21 is often the shortest day of the year and is sometimes regarded as the first day of winter. ... In the Southern Hemisphere, December 21 is often the longest day of the year and occurs during the southern summer.
Basically Astara is always celebrating the Light and as this day ushers in the promise of longer days of light or (Light), it is recognized as a turning point and reminder for humanity to turn towards the Light or the Divine.
There is always darkness but the Light is always there to tap into, to embody and to share with the world.