Timelapses of Earth powered by community science.
Used by organizations worldwide to monitor the environment and inspire stewardship.
Featured chronologs
150k
Photos Submitted
1,000
Chronolog Sites
48
U.S. States
10
Countries
How Chronolog Works
Organizations set up a chronolog photo station.
A passerby aligns their phone, snaps a photo, and emails it to chronolog.
Their photo is automatically added to the right chronolog timelapse.
Chronologs engage your community and record environmental change.
What are chronologs monitoring?
Recent Photo Submissions
Jul 13, 2025
Photo added to Horseshoe Lake Loop, Denali National Park & Preserve, Alaska, US
Monitor the environment.
Engage your community.
Info for Organizers
For nature-lovers
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For organizations
Chronolog is a monitoring tool for parks, nature centers, wildlife organizations, schools, and museums worldwide. With over 100,000 contributors across 300 organizations, Chronolog is on a mission to engage communities with nature while recording important natural changes.
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