Information on Vitamin D Synthesis / Erythemal UV

Japanese

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

Exposure Time around Noon (min.)
January February March
early middle late early middle late early middle late
MED 80 80 70 60 50 50 50 45 40
600 cm2 30 30 25 20 20 20 20 15 15
1200 cm2 15 15 10 10 9 10 9 8 7

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

July August September
early middle late early middle late early middle late
MED 25 25 20 25 20 25 30 45 40
600 cm2 9 8 7 8 7 8 10 15 15
1200 cm2 5 4 3 4 4 4 5 8 7

October November December
early middle late early middle late early middle late
MED 40 70 80 50 70 70 70 70 80
600 cm2 15 25 30 20 30 30 25 30 30
1200 cm2 7 10 15 9 15 15 15 15 15

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 Miyazaki