Starting on the Equinox
Starting on the Equinox (September 23), report your day length every month throughout the coming year.
What to Report
How to Report your Day Length (Photoperiod)
Step 1: Look up your sunrise/sunset for September 22.
Step 2: Calculate the length of time between sunrise and sunset.
Step 3: Report your day length for September 22.
Step 4: Explore the daylight map.
How to Participate
Report on the 20th of every month, and on each equinox and solstice. Track changes in daylight over the course of the year on the sunlight map. Explore how day length changes in your part of the world as the Earth revolves around the Sun. Share and compare seasonal observations with people around the globe.