The Nautical Almanac
The free online Nautical Almanac
The world's most complete source of free celestial navigation information


Methods & Forms



Complete Sun Sight reduction Procedure


Complete and thorough step-by-step instructions for performing a Sun sight reduction.
Includes how to plot an LOP.
Plenty of pictures and examples.
Perfect for beginners.


Another version
Complete Sun Sight reduction Procedure


  Thorough step-by-step instructions for performing a Sun sight reduction.
For use with an Artificial Horizon or ocean horizon
Formatted differently in appearance than the procedure above.
Does not include how to plot an LOP.
Perfect for beginners.



Complete Star Sight reduction Procedure
Based on Pub. No. 249 Vol. 1

Complete and thorough step-
by-step instructions for performing a
star sight reduction based on Pub. No. 249 Vol. 1 (aka- Ho-249
)
Perfect for beginners using an AH


How to plot a LOP

Complete and thorough step-by-step instructions that will show you how to plot a LOP
Includes everything you need except tools



Artificial Horizon
You don't have an ocean horizon?
Make a simple Artificial Horizon




Determine Longitude

Meridian by Equal Altitudes



Determine Latitude by Noon-Sight

Obtain your Latitude using the Sun and an artificial or ocean horizon




Determine Latitude using Polaris

Obtain your Latitude using the Polaris and an artificial or ocean horizon





Sight Reduction Forms

  Sun, Star & Planet sight reduction forms using Ocean Horizon or Artificial Horizon