Exposure Time for Vitamin D Synthesis / MED (Climatology):Cape Ochi-ishi
Exposure Time around Noon (min.)
January
February
March
MED 230 220 200 150 120 100 100 80 70
600 cm2 130 120 100 70 60 40 40 30 25
1200 cm2 70 60 50 35 30 20 20 15 12
April
May
June
MED 65 55 50 50 45 45 40 40 40
600 cm2 24 20 15 20 15 15 15 15 15
1200 cm2 12 10 8 9 8 8 7 7 7
July
August
September
MED 40 40 40 40 40 40 45 50 55
600 cm2 15 15 15 15 15 15 15 20 20
1200 cm2 7 7 7 7 7 7 8 9 10
October
November
December
MED 70 90 100 150 180 200 230 250 250
600 cm2 30 40 40 65 90 100 140 150 150
1200 cm2 15 20 20 30 40 55 70 75 75
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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).