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

Exposure Time around Noon (min.)

January February March early middle late early middle late early middle late MED 120 120 130 90 80 70 60 50 45 600 cm2 55 55 60 40 30 25 22 18 15 1200 cm2 30 30 30 20 15 13 11 9 8

April May June early middle late early middle late early middle late MED 35 40 35 30 30 30 30 30 30 600 cm2 13 13 12 10 10 10 10 10 10 1200 cm2 7 7 6 5 5 5 5 5 5

July August September early middle late early middle late early middle late MED 32 25 22 22 25 30 30 45 40 600 cm2 12 9 8 8 9 9 10 12 15 1200 cm2 6 5 4 4 4 6 5 6 7

October November December early middle late early middle late early middle late MED 40 50 60 65 80 90 110 120 120 600 cm2 15 17 22 25 30 40 50 55 55 1200 cm2 8 9 11 12 15 20 25 30 30

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 Otsu