Information on Vitamin D Synthesis / Erythemal UV

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

Exposure Time around Noon (min.)
January February March
early middle late early middle late early middle late
MED 150 150 150 150 100 70 80 55 60
600 cm2 60 80 80 60 50 25 30 20 25
1200 cm2 30 40 40 30 25 15 15 10 10

April May June
early middle late early middle late early middle late
MED 70 50 35 40 35 35 30 35 45
600 cm2 25 20 15 15 10 15 10 10 15
1200 cm2 15 9 6 7 6 6 5 6 8

July August September
early middle late early middle late early middle late
MED 35 40 45 35 40 40 40 60 60
600 cm2 15 15 15 10 15 15 15 20 20
1200 cm2 6 7 8 6 6 7 7 10 10

October November December
early middle late early middle late early middle late
MED 60 70 80 80 100 100 100 150 150
600 cm2 20 30 30 30 40 50 50 60 70
1200 cm2 10 15 15 15 20 25 25 30 35

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), Tsukuba (Ibaraki), Yokohama (Kanagawa), Nagoya (Aichi), Otsu (Shiga), Osaka (Osaka), Miyazaki (Miyazaki), Cape Hedo (Okinawa), Hateruma (Okinawa).

Position of Nagoya