NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Navigation algorithms
From: Kent Crispin
Date: 1997 Mar 13, 18:25 EST
From: Kent Crispin
Date: 1997 Mar 13, 18:25 EST
wmurdoch@XXX.XXX (Bill Murdoch) said: > [...] > > If you go to a programmable calculator, it is not too hard to calculate the > GHA of the sun, declination of the sun, semidiameter of the sun, and the GHA > of Aries with an accuracy (1 standard deviation) of 0.1' over a 200 year > period. It takes from 1500 to 2500 keystrokes to program the calculator. You > need only do it once. After that all you need do is enter the usual time, > position, sextant reading, and corrections data and the programmable > calculator will do the rest. Speaking of which, and in light of previous comments on the list about starting an archive of navigation programs and such, I have translated Bill's most excellent TI-82 calculator program into "C". I checked with him, and he doesn't mind if I make it available publically. It can be retrieved at ftp://songbird.com/pub/astro.c A MSDOS executable that runs in HP Palmtop computers is also there: ftp://songbird.com/pub/ASTRO.EXE If there is interest I could just send it (the source) to the list -- it's only about 250 lines long. <PRE> -- Kent Crispin "No reason to get excited", kent@XXX.XXX PGP fingerprint: B1 8B 72 ED 55 21 5E 44 61 F4 58 0F 72 10 65 55 http://songbird.com/kent/pgp_key.html </PRE>
