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Track Changes in Day Length

Explore how day length changes in your part of the world as the Earth revolves around the Sun. Share and compare observations with people around the globe.

Report your photoperiod:

1. Report for dates listed below.

2. Find your sunrise/sunset: Look-up

3. Calculate your daylength.

4. Report your daylength: Select "Daylight"

Dates to Report

August 1
September 1
September 22 (Equinox)
October 1
November 1
December 1
December 21 (Solstice)

January 1
February 1 March 1
March 20 (Equinox)
April 1
May 1
June 1
June 21
July 1


Report to the Map!

Photoperiod is the length of time between sunrise and sunset.

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