Me and My Shadow – A Rule-of-Thumb for Safe Sun Exposure
An easy way to tell how much ultraviolet (UV) radiation exposure you are getting is to look for your shadow:
- If your shadow is taller than you are (in the early morning and late afternoon), then your UV exposure is likely to be low.
- If your shadow is shorter than you are (around midday), then you are being exposed to high levels of UV radiation.