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Our Projects

Build an EarthDial

Specifications for an EarthDial
The measurements and necessary components for a standard EarthDial

How to Build an EarthDial
Step-by-step instructions (also available in PDF format or as a summary in Spanish)

How to Read a Sundial
What time is it?

EarthDial Glossary
Face, furniture, gnomon, gnomonicist, motto, style

EarthDial Calculator 
Calculates the locations of the lines on the face of the EarthDial for your latitude

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Support our Asteroid Hunters

They are Watching the Skies for You!

Our researchers, worldwide, do absolutely critical work.

Asteroid 2012DA14 was a close one.
It missed us. But there are more out there.

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The Planetary Report

The Summer Solstice issue is out!

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Space in Images

Pretty pictures and awe-inspiring science.

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