Description:
Nautical Publication Number: NP 321
This almanac contains positions of the Sun, Polaris and selected bright stars in a form
which is convenient for land surveyors who use astronomical observations to determine their
geographical position or direction to true north. This edition includes a CD-RoM which
contains the almanac in pdf format and the coefficients representing the positions of the
Sun and stars in ASCII files.
ASCII data files are available on the CD-RoM which contain coefficients for calculating the Greenwich hour angle and declination of all the stars published in The Star Almanac, accurate to about 1 arcsecond. The polynomial coefficients for calculating R (GHA Aries - UT), declination, E and semi-diameter of the Sun published on page 75 of the Almanac are also included.
Starting with the 2011 edition, this publication is now printed on A5 paper.
Purchase:
To buy HMNAO Astronomical Publications including The Star Almanac for Land Surveyors please select from the links below:
Preferred UKHO Distributors: Thomas Gunn Online Shop
You can also order your copy from Admiralty Paper Distributors.
Other Outlets: TBA
Status:
- The 2013 edition is currently available:
UKHO Nautical Publication number: NP 321-13
Published in the UK: 2012 May 24th
13 character ISBN: 978-0-7077-41383
Pages: 80
Retail price: £18.25 - The 2014 edition will soon be available:
UKHO Nautical Publication number: NP 321-14
Published in the UK: 2013 May/June
13 character ISBN: TBA
Pages: 80
Retail price: £ TBA - If you have difficulty in finding this publication please contact UKHO Customer Services:
- By e-mail:
- By telephone:
- By fax:
- By post:
- customerservices@ukho.gov.uk
- +44 (0) 1823 723366
- +44 (0) 1823 330561
- Customer Services
- UK Hydrographic Office
- Admiralty Way
- Taunton, TA1 2DN
- United Kingdom