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Tag Archives: navigation
The Demystified Astro Navigation Course – Unit 4
Unit 4 – The Importance of Altitude, Azimuth and Zenith Distance in Astro Navigation. Zenith. The Zenith is an imaginary point on the celestial sphere directly above the observer. It is the point where a straight line drawn from the … Continue reading →
The Demystified Astro Navigation Course Unit 3 Part 3
Unit 3 Part 3 – Altitude Correction tables for the Moon Note. Units of this course can be viewed in numerical order under ‘Astro Nav Course’ on the menu bar. The Moon’s Semi-Diameter. When the Moon is not full, sometimes … Continue reading →
The Demystified Astro Navigation Course – Unit 3 Part 1
Unit 3 Part 1 – Altitude and Azimuth The Azimuth is similar to the bearing in that it is the angle between the observer’s meridian and the direction of the celestial body. However, whereas bearings are measured clockwise from north … Continue reading →
Calculating the Distance Between Meridians of Longitude Along a Parallel of Latitude.
At the Equator, the distance between meridians of longitude is 60 n.m. (or 60.113 to be precise). However, as we move north or south away from the equator, we find that the distance between them decreases as they converge towards … Continue reading →
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Altitude Correction for Parallax
As shown in the following diagram, the observer measures the altitude in relation to the visible horizon from his position at O on the Earth’s surface. So, the observed altitude is the angle HOX. However, the true altitude is measured from the … Continue reading →
Posted in astro navigation, Astro Navigation Topics, astronomy, celestial navigation
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Altitude Correction for Dip
Dip. A correction has to be made to the sextant altitude to allow for the height of the observer’s eye above the horizon; this is known as Dip. Consider the diagram below: O is an observer’s position on the Earth’s … Continue reading →
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Converting GMT To GHA
Greenwich Mean Time (GMT) is the local mean time anywhere on the meridian of Greenwich. In other words it is the Local Hour Angle of the Mean Sun on the meridian of Greenwich. Since the Greenwich meridian is used as the … Continue reading →
Posted in astro navigation, Astro Navigation Topics, celestial navigation
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Tagged astro navigation, celestial navigation, Equation of time, navigation, Time
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Finding Stars and Constellations, Part IV
This post continues the series Finding Stars and Constellations. Boötes The Herdsman If we take a line from Alioth to Alkaid in the Great Bear and extend that line in an -imaginary curve for about roughly three hand-spans … Continue reading →
Calculating Azimuth And Altitude At The Assumed Position By Spherical Trigonometry.
There are several ways of calculating the azimuth and altitude at the assumed position; these include the use of sight reduction methods and software solutions. However, the traditional method is by the use of spherical trigonometry which is demonstrated below. … Continue reading →
The Accuracy of Astro / Celestial Navigation
U.S. Navy and Royal Navy navigators are taught that the accuracy of astro navigation is ±1 minute of arc or 1 nautical mile and that where position lines are derived from astronomical observations, the resultant position is not known as a … Continue reading →
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Astro Navigation Demystified 
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