this post was submitted on 20 Nov 2023
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I wondered the same thing, since I have been wearing a hoodie a good bit recently…
In the Health section on it, it states “When unobstructed, Apple Watch can automatically record an estimated amount of Time in Daylight in Health,” (emphasis mine), so I suspect we are not going to get very good reading during the winter months even if we’re outdoors…
My guess is that it uses GPS information combined with the weather information to get an estimate. I haven't really done any measurements to check accuracy. But I have exclusively been wearing long sleeves for at least two months now and so far it seems OK.