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Exposure Time for Vitamin D Synthesis / MED (Climatology):Hateruma

Exposure Time around Noon (min.)

January February March early middle late early middle late early middle late MED 50 50 50 40 35 32 32 30 30 600 cm2 20 20 15 15 12 11 11 10 9 1200 cm2 10 10 8 8 6 6 6 5 5

April May June early middle late early middle late early middle late MED 25 25 25 23 21 20 20 20 18 600 cm2 9 9 9 8 7 7 7 7 6 1200 cm2 4 4 4 4 4 4 4 4 3

July August September early middle late early middle late early middle late MED 18 18 20 20 20 20 20 20 20 600 cm2 6 6 6 6 6 6 6 6 7 1200 cm2 3 3 3 3 3 3 3 3 4 4

October November December early middle late early middle late early middle late MED 22 25 30 33 40 45 50 50 50 600 cm2 7 9 10 12 13 15 20 20 20 1200 cm2 4 5 5 6 7 8 10 9 10

The numerical values in the row of 'MED', '600 cm²' and '1200 cm²' show the mean time to reach MED (Minimal Erythema Dose), the time required for 10 µg Vitamin D to be produced for a skin area of 600 cm², and 1200 cm² exposed to solar radiation in minutes, respectively.
By clicking each 10 day period, you can also see a diurnal variation of exposure time for that period.

Appropriate exposure time at every site shown below can be seen.
Cape Ochi-ishi (Hokkaido), Rikubetsu (Hokkaido), Sapporo (Hokkaido), Aomori (Aomori), Sendai (Miyagi), Tsukuba (Ibaraki), Yokohama (Kanagawa), Nagoya (Aichi), Otsu (Shiga), Osaka (Osaka), Miyazaki (Miyazaki), Cape Hedo (Okinawa), Hateruma (Okinawa).

Position of Hateruma