Search Results for: Local hour angle

The Purpose of Altitude and Azimuth Angle in Position Finding at Sea

To fully understand how the azimuth angle and the altitude of a celestial body help us to establish our position, we need to consider them in relation to the celestial sphere. Consider the diagram below: The celestial sphere is drawn … Continue reading

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The Importance of Altitude and Azimuth Angle in Position Finding

To fully understand how the azimuth angle and the altitude of a celestial body help us to establish our position, we need to consider them in relation to the celestial sphere. Consider the diagram below: The celestial sphere is drawn … Continue reading

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Accuracy of Sight Reduction Methods.

In my recent article ‘Why Astro‘, I highlighted the risks in using the GPS.  Since writing that article, I am frequently asked “if astro / celestial navigation is to be used, which of the many systems is the best”.  Sight … Continue reading

Posted in astro navigation, celestial navigation, global positioning system, gps, Marine Navigation, mathematics, navigation, spherical trigonometry, trigonometry | Tagged , , , , | Leave a comment

Accuracy of Sight Reduction Methods.

In my recent article ‘Why Astro‘, I highlighted the risks in using the GPS.  Since writing that article, I am frequently asked “if astro / celestial navigation is to be used, which of the many systems is the best”.  Sight … Continue reading

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The Importance Of Morning And Evening Star Sights

Part 1 – Checking to see which stars and planets will be above the observer’s horizon during Nautical Twilight. By Jack Case Introduction. The Astronomical Position Line.  A position line is a line drawn on a nautical chart along which … Continue reading

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THE IMPORTANCE OF MORNING AND EVENING STAR SIGHTS

Part 1 – Checking to see which stars and planets will be above the observer’s horizon during Nautical Twilight on a certain day. By Jack Case INTRODUCTION The Astronomical Position Line.  A position line is a line drawn on a … Continue reading

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The Importance of Morning and Evening Stars – Part 2

The ‘Where To Look’ Method. Devised by Jack Case As discussed in part 1, our aim in, astro navigation, is to calculate the azimuth angle and altitude of a celestial body from our DR position and then to compare the … Continue reading

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The Importance of Morning and Evening Star Sights – Part 2

The ‘Where To Look’ Method. Devised by Jack Case                          HOME In part 1 of this series, we discussed how we can establish whether or not a selected star  … Continue reading

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Astro Navigation In A Nutshell Part 1

Links Astro Navigation in a Nutshell Part 2 Astro Navigation in a Nutshell Part 3 Astro Navigation in a Nutshell Part 4 Part 1 – The Importance of Azimuth and Altitude.  The theory of astro navigation depends on the ability … Continue reading

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Astro Navigation in a Nutshell Part 1

Links Astro Navigation in a Nutshell Part 2 Astro Navigation in a Nutshell Part 3 Astro Navigation in a Nutshell Part 4 Part 1 – The Importance of Azimuth and Altitude.  The theory of astro navigation depends on the ability … Continue reading

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