D-Vitamin Sun Exposure in Nishi-Tokyo-shi Today

Can my body produce
vitamin D

from being in the sun in Nishi-Tokyo-shi right now?

YES

EXPLANATION

To naturally produce vitamin D your skin needs to be exposed to the UVB radiation.
Unless the sun is at an elevation higher than 45° the UVB is filtered out by the atmosphere.
Currently, the sun is at 54.7° where you are. As consequence your body CAN produce vitamin D. See RED section in graph below.

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CAUTION

Being in the sun in the middle of the day can be dangerous. While vitamin D is essential to us there is no reason to overdo it.
You do not need to be in the sun for long to saturate your body's daily ability to create vitamin D. As little as 15 minutes is sufficient.
Even when wearing sunscreen the small percentage that still passes that barrier is sufficient for your body to create vitamin D. Wear sunscreen and/or cover the most exposed parts with clothes.
Even on cloudy days sufficient amount of UVB passes through the clouds to support your vitamin D production.
If you are at a high altitudes the amount UVB is much higher than at sea-level.

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Created on a rainy day by Tobias Hill.