Description
2024 Nautical Almanac (Commercial Edition)
The Nautical Almanac is the cornerstone for all sight reduction.
To find the position of a ship or aircraft by celestial navigation, the navigator measures with a sextant the apparent height of a celestial body above the horizon. They then take notes the time from a marine chronometer. That height is compared with the height predicted for a trial position; the arcminutes of height difference is how many nautical miles the position line is from the trial position.
The Nautical Almanac lists the positions of the sun, moon, stars, and planets that are used for navigation. This listing is hourly, for each day of the calendar year. It also contains a short version of a sight reduction table that may be used in an emergency.
For all almanacs and other tidal data, have a look here.
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