Sight Reduction Tables
These Sight Reduction Tables have been condensed into as compact a form as possible. Each set of tables covers seven degrees of Latitude, which should satisfy the needs of most people. Simply download the set, or sets, that best matches your cruising latitude.
The files are ~750KB each.
Declination in these Sight Reduction Tables is limited to 23 Degrees. The rationale being these tables are for reducing a Sunsight where the declination never exceeds 24 Degrees.
Most of us amateurs sail in the summer when Latitude and Declination are the SAME. These tables make the transition from SAME, at the front, to CONTRARY towards the rear, as seamlessly as I could contrive. No flicking through SAME/CONTRARY/SAME/CONTRARY page after page.
Where in the tables the transition from SAME to CONTRARY occurs depends on your selected Latitude and LHA. It should all become clear when you start using the tables.
It's also worth pointing out that Sight Reduction Tables do NOT go out of date. Download them once, print them, bind them with nice covers and they're yours forever.
These Sight Reduction Tables include pages for GHA minutes and seconds interpolation, Declination interpolation and Sextant corrections.
I think my Sight Reduction Tables are quicker and easier to use than the official NIMA Pub.229 Tables, but the choice is yours.
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Sight Reduction Form
On one side you can reduce two sights and on the reverse you will find a plotting sheet. Ideal for that "Sun-run-Sun" sight. Download.