Search Results for: GREENWICH HOUR ANGLE

Translating A Celestial Position Into A Geographical Position.

This follows the previous post which discussed the Celestial Co-ordinate System. If we wish to use a celestial body’s position in the celestial sphere to help us to navigate on the Earth’s surface, we must be able to translate that … Continue reading

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Translating a Celestial Position Into a Geographical Position.

This follows the previous post which discussed the Celestial Co-ordinate System. If we wish to use a celestial body’s position in the celestial sphere to help us to navigate on the Earth’s surface, we must be able to translate that … 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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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 Demystified Astro Navigation Course Unit 2

Unit 2 – Local Hour Angle and Greenwich Hour Angle  Local Hour Angle (LHA).  In astro navigation, we need to know the position of a celestial body relative to our own position. (The following diagram illustrates the explanations given below). LHA … Continue reading

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The Demystified Astro Navigation Course Unit 2

Unit 2 – Local Hour Angle and Greenwich Hour Angle  Local Hour Angle (LHA).  In astro navigation, we need to know the position of a celestial body relative to our own position. (The following diagram illustrates the explanations given below). LHA … Continue reading

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Meridian Passage Short Method

Meridian Passage Methods.  Short Method.  In the case of stationary or very slow moving vessels, it is acceptable to use the Meridian Passage Short Method which involves calculating the time of meridian passage at the current DR position. Long Method.  … Continue reading

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Meridian Passage Short Method

Meridian Passage Methods.  Short Method.  In the case of stationary or very slow moving vessels, it is acceptable to use the Meridian Passage Short Method which involves calculating the time of meridian passage at the current DR position. Long Method.  … Continue reading

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