ERRORS FOUND in H.Umland’s java script calculation programs previously shown on this page.
His Almanac produces incorrect data for current dates and therefore his calculation programs should not be used. Many thanks go to Carl Smithson for drawing our attention to these errors. We checked out his work a long time ago on a few of our 1970’s sextant sites and found it reasonably accurate. But a check on his data for 2014/15 shows errors.
A newer program has been released by Rodger Farley of Teacup Navigation which has more bells and whistles, including crossing multiple sights and stars sights. Rodger and I worked through a half dozen of our old sextant sights from the 70s to compare results and his program works to a tee. Furthermore, it produces accurate results for 2014/15 Check it out. It is also free.
Disclaimer by Rodger Farley of Teacup Navigation: USER BEWARE! The programmer does not guarantee or warrant the accuracy or use or results of any of the materials provided here. You, the user, are TOTALLY responsible for validating the results from from these free materials, and you the user are TOTALLY responsible for any result that may occur from either the proper use, or the improper use of these materials.