howmuchsun

Vitamin D from sunlight in Sudan

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 Sudan.

CityLatitudeElevationVitamin D winter
Khartoum 15.55°N 381 m none
Omdurman 15.64°N 391 m none
Khartoum North 15.65°N 381 m none

How these dates are calculated