Nautical Publication Number: NP 314
This is the essential yearly reference work for celestial navigation at sea using a marine sextant. It is carried on every ship of the Royal Navy and on many sea-going vessels around the world. It is also at the core of celestial navigation training courses worldwide.
The Nautical Almanac contains tabulations of the Sun, Moon, navigational planets and stars for use in the determination of position at sea from sextant observations. In addition, it gives times of sunrise, sunset, twilights, moonrise and moonset, phases of the Moon and eclipses of the Sun and Moon for use in the planning of observations. All the necessary interpolation and altitude correction tables are provided as well as pole star tables and diagrams and notes for the identification of stars and planets. Information on standard times for most countries around the world is provided. A concise set of sight reduction tables and a sight reduction form are also included.
New for the 2016 edition of the Nautical Almanac onwards is a six-page supplement of polar astronomical phenomena including semidurations of sunlight, civil twilight and moonlight.
A joint publication with the United States Naval Observatory.
You can purchase your copy from Admiralty Paper Distributors.
The Nautical Almanac 2017
UKHO Nautical Publication number: NP 314-17
Published in the UK: 2016 April 14th
13 character ISBN: 978-0-70-774-1703
Retail price: Follow this link
PDF copies of the NA concise sight reduction form are available: