Why Do We Have Leap Years?
The Big Idea
Unlock the cosmic math behind our calendar. Discover why we need an extra day every four years to keep our clocks in sync with the Earth's 365.25-day journey around the Sun.
Key Vocabulary & Concepts

Hands-On Observation Checklist
Teacher & Parent Discussion Starters
- Why is understanding why do we have leap years? important in everyday real life?
- What variable or factor had the biggest impact when testing the simulation?
- How does this concept connect to another science topic you have learned about?
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