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A resource for those interested in the history, theory and practice of determining time by measuring the angle between the moon and the sun, stars or planets.


What is the lunar distance and why is it so interesting? For a quick introduction, click here.

For basic theory and instruction on  how to observe the lunar distance at home, click here.

For links to a variety of lunar distance topics and resources, click here.

The Navigation-L discussion list is an excellent source of in depth information about the lunar distance.  For inks to selected topics and materials referenced on the Nav-L, click here.

This website is intended to make it easier for amateur navigators, astronomers and nautical historians to get involved with the lunar distance method in theory and practice. I hope to add links and information over time. Please pass along any comments, corrections or suggestions.

Arthur N. Pearson
Belmont, Massachusetts, USA                                visitors since May 30, 2003