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NASA and the Smithsonian have a cooperative project to put a large
collection of astronomy publications online.

Go to http://www.adsabs.harvard.edu/ and click the Browse link.

Some of this material is interesting to the celestial navigator. For
example, here's a Lick Observatory report on an expedition to observe
the total eclipse of the Sun in the northwest U.S. on June 8, 1918. They
used a sextant and "mercurial horizon" to determine the observing site's
latitude and longitude. A nearby telegraph station provided time signals
to calibrate the chronometer. The report notes that the high Sun
altitude as it crossed the meridian made latitude observations difficult
with a sextant.


http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1918LicOB..10....1C&db_key=AST&page_ind=0&plate_select=NO&data_type=GIF&type=SCREEN_GIF&classic=YES

One non-obvious technique on this page
http://adsabs.harvard.edu/journals_service.html
is to select the title of the journal in the list, enter a number in the
Volume # box, but leave the Page #, Plate #, and Cover # blank. That
will retrieve a table of contents for that volume, with clickable links
to the articles. On the other hand, entering a number in the Page # box
gets you a page of clickable thumbnail images of the pages in the
requested volume.

Another interesting site is "Making of America Books". Try browsing the
categories Astronomy, Navigation, Spherical, Trigonometry, etc.

http://quod.lib.umich.edu/m/moa/

Both these sites are satisfactory with a dial-up connection. You can
view the documents a page at a time.

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