howmuchsun

Vitamin D from sunlight in Georgia

How long you need in the sun to make vitamin D, and when the sun is too low to make any at all, for 3 cities in Georgia.

CityLatitudeElevationVitamin D winter
Tbilisi 41.69°N 433 m 31 Oct – 18 Feb (111 days)
Batumi 41.64°N 8 m 30 Oct – 19 Feb (113 days)
Kutaisi 42.27°N 153 m 28 Oct – 21 Feb (117 days)

How these dates are calculated