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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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LightSail - Flight by Light

Support LightSail!

In 2016, The Planetary Society’s LightSail program will take the technology a step further.

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Our Curiosity Knows No Bounds!

Become a member of The Planetary Society and together we will create the future of space exploration.

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Space in Images

Pretty pictures and
awe-inspiring science.

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Join the New Millennium Committee

Let’s invent the future together!

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