The Exploratorium is temporarily closed. Explore our online resources for learning at home.
Before there were clocks, people used shadows to tell time!
Based on fifth-grade NGSS standards; appropriate for grades 4–6
Why is your shadow longer in winter than in summer? Grab a basketball and some paperclips and find out!
The Solar Hour Benches are a set of six oval benches, each with a slit aperture aligned with the sun for one particular hour: 10:00 a.m., 11:00 a.m., noon, 1:00 p.m., 2:00 p.m. or 3:00 p.m. solar time.
Explore the shifting light of day.
Mounted mirrors sway with the tide in unpredictable ways, dispersing sunlight across the deck.
Nine clocks show the current time on other planets and our moon.
Pier 15 (Embarcadero at Green Street)San Francisco, CA 94111(415) 528-4444
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