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Category Archives: astronomy
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 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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The Ecliptic, The Age of Aquarius and the Tropics.
The Ecliptic. Because of the orbital motion of the Earth, the Sun appears to us to move around the celestial sphere taking one year to complete a revolution. This apparent movement of the Sun is called the Ecliptic. A year … Continue reading →
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 →
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 →
Rising and Setting Times of Stars.
It is very useful to be able to calculate the times at which the principal stars and constellations will rise in the east. It is also helpful to be able to predict the approximate position of the star or constellation … Continue reading →
The Intercept Method
Although it is usual these days to calculate an observed position in astro navigation by using the Rapid Reduction Method, there are other methods which do not necessitate the purchase of expensive reduction tables. One of these methods is the … Continue reading →
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Tagged astro navigation, astronomy, celestial navigation, navigation
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Astro Navigation Demystified 
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