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It would be useful, almost required to get some sort of Nautical Almanac, which some of the larger Libraries have. Textbooks on astronomical navigation (a.k.a. celestial) would also come in handy as might Corps of Engineers technical manuals on such things as the Vertical axis Theodolite- a most versatile instrument. Get a Nautical al manac, not the farmer"s or News summary types! Good Luck, Galileo Jr!

The astrolabe or sextant was designed to perform said measurements. GPS is common, cheap and easy to use, and it has displaced the units. These tools of navigation are now inexpensive and easy to come by. (Kind of like slide rules after electronic calculators became common.) A look on eBay will probably reveal several different units in a range of prices.

Use the link to the Wikipedia article on the sextant and see what it can do.

To calculate the precise location of the sun, see the following site: http://www.astro.uio.no/~bgranslo/aares/calculate.html

For an on-line calculator in JavaScript check here: http://www.learn.londonmet.ac.uk/packages/daymedia/axel/sky/sunpath_calc.html

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