Astro Navigation Demystified
Navigate Without GPS
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  • Stars/Planets
    • The Retrograde and Prograde Motions of Mars and Jupiter
    • Stars For All Seasons Part 1
    • Stars For All Seasons Part 2
    • Stars For All Seasons – Part 3
    • Stars For All Seasons Part 4
    • Stars For All Seasons Part 5
    • Stars For All Seasons – Part 6
    • Stars For All Seasons Part 7. Spring Stars in the Northern Hemisphere.
    • Finding The Stars and Constellations. Part I
    • Finding Stars and Constellations Part II
    • Finding Stars and Constellations – Part III
    • Finding Stars and Constellations – Part IV
    • Planning Star and Planet Sights
    • Predicting the Rising and Setting Times and Positions of Stars.
    • The Southern Cross
    • How To Locate Polaris (Pole Star / North Star)
    • Venus – Evening Star or Morning Star?
    • Latitude From Polaris
  • Moon
    • Phases of The Moon
    • Tidal Effects of the Moon.
    • Measuring the Altitude of the Moon.
    • Survival – Finding Direction From The Moon.
    • Lunar Distance
  • Sun / Earth
    • The First Point of Aries
    • The Ecliptic, The Age of Aquarius and the Tropics.
    • The Sun’s Declination, the Equinoxes and the Solstices
    • The Relationships Between Longitude and Latitude and the Nautical Mile.
    • North/South Movement of the Sun
  • Time.
    • Converting GMT to GHA
    • The Sun as a Time Keeper
    • The Equation of Time
    • Sidereal Time
    • Zone Time
    • Local Hour Angle and Greenwich Hour Angle
    • Time difference between meridians of longitude.
  • Astro Navigation
    • What Is Astro Navigation?
    • What’s The Point Of Astro Navigation When We Have GPS?
    • Why Astro?
    • The Accuracy Of Astronomical / Celestial Navigation
    • Making An Ocean Plotting Sheet
    • Planning Star and Planet Sights
    • In Defence of Mer Pas
    • The Celestial Co-ordinate system.
    • Translating a Celestial Position Into a Geographical Position.
    • The Importance of Altitude and Azimuth in Celestial navigation.
    • Bearing, Azimuth and Azimuth Angle.
    • Astro Navigation in a Nutshell Part 1
    • Astro Navigation In A Nutshell Part Two
    • Astro Navigation In A Nutshell Part 3
    • Astro Navigation In A Nutshell Part Four
    • Understanding Meridian Passage (Mer. Pas.).
    • Applying the Equation of Time when calculating longitude at the Sun’s meridian Passage.
    • Meridian Passage Short Method
    • Meridian Passage Long Method
    • Altitude Correction for Parallax
    • Altitude Correction for Semi-Diameter
    • Altitude Correction for Dip
    • The Astronomical Position Line
    • The Relationship Between Altitude and Zenith Distance
    • Planning Star and Planet Observations
    • Calculating Latitude From The Midday Sun
    • What’s The Point Of Calculating Our Latitude From The Altitude Of The Sun At Midday?
    • Calculating Longitude
    • Accuracy of Sight Reduction Methods.
    • THE IMPORTANCE OF MORNING AND EVENING STAR SIGHTS
    • The Importance of Morning and Evening Stars – Part 2
    • The Importance of Altitude and Azimuth Angle in Position Finding
  • Astro Nav Course
    • Making An Ocean Plotting Sheet
    • The Demystified Astro Navigation Course Unit 1
    • The Demystified Astro Navigation Course Unit 2
    • The Demystified Astro Navigation Course Unit 2 Self Test
    • The Demystified Astro Navigation Course – Unit 3 Part 1
    • The Demystified Astro Navigation Course – Unit 3 Part 2
    • The Demystified Astro Navigation Course – Unit 3 Part 3
    • The Demystified Astro Navigation Course Unit 4
    • The Demystified Astro Navigation Course Unit 5
    • The Demystified Astro Navigation Course – Unit 6
    • Azimuth and Altitude Part 1
    • Azimuth and Altitude Part 2
    • Azimuth and Altitude Part 3
  • Survival Astro
    • Astro Navigation In A Survival Situation
    • Survival – Polynesian Star Compass (Learning from the Polynesians)
    • Survival – Pillars of the Sky (Learning from the Polynesians).
    • Survival – A Plan Of Mathematical Perfection. (Learning from the Polynesians)
    • Survival – Star Compass 1.
    • Survival – The Daytime Star.
    • Survival – Finding Direction From The Moon.
    • Survival – Calculating altitude without an angle measuring instrument.
    • Survival – Latitude From The Midday Sun
    • Survival – Latitude From The North Star
    • Survival – Find Your Longitude.
    • The Survival Sundial.
    • Calculating the Sun’s Declination in a Survival Situation
    • Survival – Make A Clinometer
    • Survival – Declination Table
  • General Interest
    • Astro Navigation in the Forests of the Iroquois
    • Could the Global Positioning System Fail?
    • Titanic and the Traverse Tables
    • Ptolemy’s Geocentric Model
    • The Pharos Lighthouse
    • Eratosthenes Proved The Earth Isn’t Flat
  • Terrestrial Navigation
    • Dead Reckoning
    • Calculating Changes in Longitude and Time Along a Parallel of Latitude.
    • Short Distance Sailing And Rhumb Line Sailing
    • Calculating Distance To The Horizon
  • Schools
    • Making An Ocean Plotting Sheet
    • Why Astro Navigation In Schools?
    • The First Point of Aries
    • The Ecliptic, The Age of Aquarius and the Tropics.
    • Calculating Azimuth And Altitude At The Assumed Position By Spherical Trigonometry.
    • Calculating Distance To The Horizon
    • Pythagoras
    • Spherical Trigonometry
    • Applying Mathematics to Astro Navigation
    • Exercise 1 – Latitude from the North Star
    • Exercise 2 = Application of Spherical Trigonometry
    • Exercise 3 – Short Distance Sailing.
    • Exercise 4 – Local Hour Angle.
    • Exercise 5 – Zone Time (ZT)
    • Exercise 6. Calculating Distance Between Meridians of Longitude Along a Parallel of Latitude.
    • Trig Tables
    • Make A Clinometer
  • Books
    • Astro Navigation Demystified
    • Applying Mathematics to Astro Navigation.
    • Celestial Navigation. Theory and Practice
    • Astronomy For Astro Navigation.
  • Sight Reduction Forms

Sight Reduction Forms

These sight reduction forms are for use with ‘Celestial Navigation Theory and Practice’ by Jack Case (publication date TBA).

The forms have been modified for use as learning aids for specific chapters of the book; they contain guidance notes to assist readers to develop the knowledge and skills needed to calculate astronomical position lines (LOPs).  They are not intended for use other than as learning aids.

Sight Reduction Form for use with Chapters 3

Sight Reduction Form for use with Chapter 5

Sight Reduction Form for use with Chapter 6

Sight Reduction Form for use with Chapter 7

Sight Reduction Form for use with Chapter 8

Sight Reduction Form for use with Chapter 10

Sight Reduction Form For Use With Chapters 13

Sight Reduction Form For Chapters 15

 

 

 

 

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  • Recent Posts

    • Venus Evening Star or Morning Star?
    • The Retrograde and Prograde Motions of Mars and Jupiter
    • Making An Ocean Plotting Sheet
    • The Purpose of Altitude and Azimuth Angle in Position Finding at Sea
    • Planning Star and Planet Sights
    • The Importance of Morning and Evening Star Sights – Part 2
    • The Importance Of Morning And Evening Star Sights
    • Stars For All Seasons Part 7 – Spring Stars in the Northern Hemisphere.
    • Stars For All Seasons Part 6
    • Stars For All Seasons Part 5
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  • Categories

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    • astronomy
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