It is named "Supplement to Nautical Almanac". In the sheet " standard latitudes " events at fixed latitudes/Greenwich longitude are shown like a traditional nautical almanac :Ī small supplementary publication was released in PDF format (contains 97 additional stars). New coordinates are required for the real estimated position (or country, town etc.). Times are expressed in Universal Time (U.T.) - Latitude 50° 24,5' North and longitude 0☀0,1 West are the geographic coordinates (approx.) of the lightvessel "Greenwich" at the southern entrance to The Channel ( in the middle of the separation zone ). On the nautical almanac the astronomical events are shown according to the geographic coordinates : nautical twilights, sunrise and sunset. and declination ) - 64 stars are tabulated (Polaris included) : Stars : position tables ( sideral hour angle - S.H.A.
Sun : Greenwich hour angle (G.H.A.) and declination tabulated at hourly intervals including increments, semi-diameter and meridian passage at Greenwich :Īries : hour tables ( Greenwich hour angle - sideral time ) : View of the The Nautical Almanac of the stars (Greenwich Mean Time) : twilight, sunrise and sunset. description of the nautical almanac ( astronomical almanac for mariners )- "excel" versionī y entering latitude and longitude of the estimated position excel automatically calculates the times of the astronomical events in U.T. The new "PDF" version contains Increments and correction tables for Sun and Aries, corrections to apply to the observed altitude of Sun and fixed star, conversion of arc to time, speed-time-distance table.
All these astronomical data and information allow mariners to calculate the ship position with the traditional method of the celestial navigation (using a sextant). Astronomical data for mariners - years 2021-2022 " The Nautical Almanac of the stars " (PDF or excel spreadsheet) The excel version generates the essential data needed for the pratice of celestial navigation - This free software creates daily pages (a printable sheet - A4).
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