Nautical Almanac 2008 Pdf |link| Official

With the total GHA and your estimated longitude, you can compute Local Hour Angle (LHA). Then, using the “Sight Reduction Tables” (Pub. 229 or 249, not included in the almanac) or a calculator, you derive a line of position.

If you are ready to begin your celestial navigation journey: nautical almanac 2008 pdf

Celestial navigation depends on extremely precise positional data. Using 2008 data in 2026 would produce position errors of several degrees (tens of nautical miles) because: With the total GHA and your estimated longitude,

The almanac’s “Altitude Correction Tables” for the Sun (pages A2–A4) will then adjust your sextant’s raw reading for refraction and semi-diameter. nautical almanac 2008 pdf