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Tag Archives: astro navigation
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 →
Posted in astro navigation, Astro Navigation Topics, celestial navigation, navigation
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Altitude Correction for Semi-Diameter
An adjustment for semi-diameter is one of the corrections that may have to be made to the sextant altitude in order to calculate the True Altitude. Corrections For The Moon’s Semi-Diameter. The point on the Moon’s circumference nearest to the … Continue reading →
Posted in astro navigation, Astro Navigation Topics, astronomy, celestial navigation
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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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The ‘Where To Look’ Method.
To determine the altitude and azimuth of a celestial body, we could make calculations by using mathematical formulae; we could compute them with the aid of sight reduction tables; we could use star globes and star charts or we could … Continue reading →
Jupiter’s Retrograde Motion
Jupiter moves across the sky in a very predictable pattern, but every now and then it reverses direction in the sky, making a tiny loop against the background stars – this is Jupiter in retrograde. The following diagram shows that, … Continue reading →
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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Finding Stars and Constellations, Part I
The usual practice for distinguishing the more conspicuous constellations is to establish reference lines in a known constellation and from these to memorize the directions in which other constellations lie on the celestial sphere. For example, one of the most well … Continue reading →
Astro Navigation Demystified 
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