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Category Archives: navigation
The Tidal Effects of the Moon
Continuing the series on the moon. If it were not for the gravitational attraction of the Sun and the Moon, the water level of the seas and oceans would be kept at equal levels by a combination of the Earth’s … Continue reading →
Posted in astro navigation, astronomy, celestial navigation, navigation
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The Moon
My recent article ‘Finding Direction By The Moon’, sparked off a flurry of correspondence on the topic of the usefulness of this celestial body in navigation and in response, the next few articles will be on this subject. PHASES OF … Continue reading →
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Survival – Finding Direction From The Moon.
Just as the Sun can help us to find our general bearings during the day, so can the Moon at night. Moonrise and Moonset. As in the case of the Sun, the Moon will rise between north east and south … Continue reading →
Posted in astro navigation, astronomy, celestial navigation, navigation, Schools, Survival
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Survival – The Daytime Star
Just as the stars can be your compass at night, there is another star to guide you during the day and that of course is the Sun. Sunrise/Sunset. We are taught that the Sun rises in the East and sets … Continue reading →
Survival – The Star Compass
“Know The Stars And You Will Always Have A Compass”. In a survival situation, whether at sea or on land, the chances are you may have nothing to navigate by other than the stars in the sky. Finding the Direction … Continue reading →
The Demystified Astro Navigation Course Unit 6
UNIT 6 – Calculating zenith distance and azimuth at assumed position. We can use sight reduction tables to calculate the zenith distance and azimuth at the assumed position or else we can use the traditional method of making the calculations … Continue reading →
The Demystified Astro Navigation Course – Unit 1
Unit 1 Essential Astronomy for Navigators The Celestial Sphere is an imaginary sphere with the Earth located at its centre. We imagine that the ‘celestial bodies’ such as the Sun, Moon, stars and planets are placed on the inner surface … 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 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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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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