howmuchsun

Vitamin D from sunlight in India

How long you need in the sun to make vitamin D, and when the sun is too low to make any at all, for 8 cities in India.

CityLatitudeElevationVitamin D winter
Mumbai 19.07°N 8 m none
Delhi 28.65°N 227 m none
Bengaluru 12.97°N 920 m none
Hyderabad 17.38°N 515 m none
Ahmedabad 23.03°N 56 m none
Chennai 13.09°N 14 m none
Kolkata 22.56°N 11 m none
Surat 21.20°N 20 m none

How these dates are calculated