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U.S. House Declares National Pi Day - March 14
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Celebrate Astronomy Day

We are a crowd-sourced resource for Astronomy


Share content or an activity, ask astrophysicist Alex Filippenko
a question in our Ask Alex section, or get an astronomy shirt
and support our educational public outreach efforts.

piZone pi it forward

We also apply $3.14 of each shirt sale
to support the efforts of Lick Observatory.