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Starting
Reading the sky
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Cloud cover changes how long you need outside, not when. Overcast daylight is still far brighter than indoor lighting. General information, not medical advice.
All times are on your device clock. For somewhere far away the events are real but the hours look shifted.
Nothing is saved. Coordinates live in memory and are gone when you close the tab. The page itself makes no network requests. "Use my location" asks your browser, and some browsers consult their own location service for that; typing coordinates never leaves this device.