Selected Stars, Epoch 2020.

This volume contains the altitude to 1´ and true azimuth to 1° for the seven stars most suitable for finding your position at sea with a sextant, for the complete range of latitudes and hour angles of Aries.

This edition is valid for the period 2016-2024. This publication is aimed at the navigator using celestial navigation and provides the optimum selection of stars for a three-star fix.

Rapid sight reduction tables that contain values of the altitude to 1 minute and azimuth to 1 degree for integral degrees of declination from 29N to 29S, for the complete range of latitudes and for all hour angles at which the zenith distance is less than 95 degrees (97 degrees between latitudes 70 and the poles) providing for sights of the Sun, Moon and planets. This volume covers latitudes between 0 and 40 degrees.

Rapid Sight Reduction Tables for Navigation Volume 3, for latitudes 39 degrees to 89 degrees and Declinations 0 degrees to 29 degrees. A reprint of NP303 Rapid Sight Reduction Tables for Navigation Volume 3 is now available. Star data in the volume has been updated to epoch 2020 to be compatible with Volume 1 (epoch 2020) of this publication and a new time zone map has been added. References to UKHO web sites have been updated.

The Admiralty Star Finder and Identifier consists of star charts for the northern and southern hemisphere together with 8 transparent templates for latitudes 0, 10, 20, 30, 40, 50, 60, 75 degrees. The chart shows 57 stars tabulated in The Nautical Almanac (NP314).

Astronomical Phenomena 2023 is now available. It contains information found in Section A of the Astronomical Almanac two years ahead. In addition to Calendarial data, there is information on eclipses, planetary phenomena and magnitudes, sun and moon rise/set times, the equation of time and the declination of the Sun and positional information on Polaris and sigma Octantis. It is aimed at those wishing to have advance knowledge of astronomical events occurring during 2023.

The Nautical Almanac contains astronomical information to support bridge crews in routine and emergency celestial navigation, as well as the calculation of daylight hours and mandatory gyro checks. It is carried on every ship within the Royal Navy and is at the core of celestial navigational training courses worldwide.

The Nautical Almanac includes:

- Tabulations of the Sun, Moon, navigational planets and stars to help determine positions at sea when using a sextant

- Times of sunrise, sunset, twilights, moonrise and moonset, phases of the Moon and eclipses of the Sun and Moon to help bridge crews plan observations

- Interpolation and altitude correction tables, pole star tables and diagrams, and notes for the identification of stars and planets

- Information on standard times for countries around the world

- A concise set of sight reduction tables and sight reduction forms

Her Majesty's Nautical Almanac Office. Astronomical / Surveying Publication. The Star Almanac for Land Surveyors for the year 2023. 

This almanac gives positions of the Sun, Polaris and selected bright stars, accurate to about 1 arcsecond, which may be used to determine a geographical position or direction to true north using astronomical observations. A pdf version of the almanac and files of coefficients is ASCII format, representing the positions of the Sun and stars, are included on the accompanying CD-Rom.