In the northern parts of the US we are getting close to the time when we stop making vitamin D from the Sun. Today you could still make vitamin D from 10:30 to 1:30pm in Pasco, Wa. but by the first of September that window drops to 11:10am to 12:50pm. Then the last day to make vitamin D in Pasco Wa, is September 5 from 11:40am to 12:10pm. If you go south the window of vitamin D gets bigger. Salina, Ks has a vitamin D window from 10:30am to 2:40pm today with the last day of September 24 from 12:00 to 12:45.
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