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  • Increments & Corrections for the Sun
  • ALTITUDE CORRECTION TABLES- MOON
  • Polaris Pole Star Tables-
  • PUB. NO. 249
  • PUB. NO. 249
  • PUB. NO. 229
  • Explanation of The Nautical Almanac Daily pages
  • TABLE 4- Long Term GHA Aries
  • Conversion of Arc to Time
  • Equation of Time Curve
  • Navigational Star Chart
  • Navigational Stars SHA & Dec for 2026
  • Air Almanac for 2026
  • Universal Plotting Sheet

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



The Nautical Almanac
1911, 1916, 1981 & 1999 through 2030



The Sun only Almanac
2015 through 2030




Lunar Distance Tables & Charts

2020 through 2030


Everything you need for 2026
click here

Planet Visibility Charts
2025 through 2030

Essential Celestial Navigation downloads

Increments & Corrections, Altitude Corrections & Polaris Pole Star Tables

  •   Increments & Corrections for Sun, Planets, Aries, Moon (the "yellow pages")
  •   Increments & Corrections for the Sun (on 2 pages)


  •   ALTITUDE CORRECTION TABLES 10°--90°—SUN,STARS,PLANETS

  •   ALTITUDE CORRECTION TABLES- MOON


  •   TABLE 5- Correction to Tabulated Altitude for Minutes of Declination
  •   Polaris Pole Star Tables- (2026)

Sight Reduction Tables
  • PUB. NO. 249  Epoch 2025
         (download individual Latitudes or Volumes)     (courtesy of Celestaire) (also known as Ho- 249
  • PUB. NO. 249  Epoch 2020
         (download individual Latitudes or Volumes)     (courtesy of Celestaire) (also known as Ho- 249)

  • PUB. NO. 229  (download individual volumes) (also known as Ho- 229)

  • Explanation of The Nautical Almanac Daily pages



  • TABLE 4- GHA and Declination of the Sun for the Years 2001 to 2036
  • How to use- TABLE 4- GHA and Declination of the Sun for the Years 2001 to 2036- Argument “Orbit Time”



  • TABLE 4- Long Term GHA Aries for years 2022 to 2030 (on 2 pages)


  • Conversion of Arc to Time

  • Equation of Time Curve

  • Navigational Star Chart
  • Navigational Star Chart- how to use it for star identification
  • Navigational Stars SHA & Dec for 2026
             from The Air Almanac 2026
  • The Air Almanac       

            Air Almanac for 2026    (27 meg)

  • Universal Plotting Sheet


‣    Complete Sun & Star sight reduction Procedure

‣  Methods & Forms

‣  Formulas for Celestial Navigation

‣  Artificial Horizon

‣  Useful Links

‣  Astron Astro Navigation Almanac and Sight Reduction calculator for sextant users
        Use in web browser.  Courtesy of Mr. Bill Ritchie

‣     Sun Sight Reduction Excel Spreadsheet
            A Sun sight reduction program!  From BackBearing.com

‣ Celestial Navigation Forum
            Discuss and learn about Celestial Navigation- All are welcome
             


Bowditch
American Practical Navigator

Organized in a useful manner
Download the Chapters, Parts or Tables you want or the entire work

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