Free seasonal tool
Your summer light
guide for Europe
Natural sunlight is the most effective light therapy available. It is also free, available every day, and almost entirely misused. Select your city for accurate sunrise times, UV windows, and safe tanning guidance — calculated for this week.
Select your city
Hourly light quality — today
Circadian window
Tan-building
Limit exposure
Avoid unprotected
Evening wind-down
Your four windows this week
Adjust for your skin type
What to know this week
Get this every Monday
The guide updates each week as sunrise shifts and UV changes. One email, every Monday morning — specific to your city.
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