Track Changes in Day Length
Overview | Dates | Questions

Photoperiod is the length of time between sunrise and sunset. Day length changes as the Earth revolves around the Sun. Join people from around the world to track seasonal changes in day length.

Report to the Map!

1. Report for dates listed below.

2. Find your sunrise/sunset: Look-up

3. Calculate your day length (photoperiod).

4. Report your day length: Select Daylight


Mystery Class Photoperiod Map Photoperiod Map: Dates to Report Photoperiod Map: Guiding Questions
Map Dates
to Report
Guiding Questions
for Map Analysis