Winter Solstice is Here
The winter solstice is the shortest day of the year in the Northern Hemisphere. What are some ways these short days affect the world around you?
What to Report
How to Report your Day Length (Photoperiod)
Step 1: Look up your sunrise/sunset for December 21.
Step 2: Calculate the length of time between sunrise and sunset.
Step 3: Report your day length for December 21.
Step 4: Explore the daylight map.
About This Project
Report your photoperiod 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.