[SAMS]

These methods were never worth a damn. If you're interested in the discovery of an accurate method for determining longitude, a good primer is Longitude by Dava Sobel

[Mo1]

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[Experiment 6-2-6]

LONGITUDE is a fantastic book, and I couldn't put it down..

My Guess is that Captain Rata and Navigator Maui got eaten at New Guinea...

[Arkady]

Longitude is a great book and Harrison was a genius.
Seems to me though, that the astronomy method did give him some good competition. A lot it depended on having good star charts.
Anyway, if anyone's interested, there's also a good book on this subject by Umberto Eco called The island of the Day Before. It's fiction, but he uses a lot of the info that is in this article.