Tag Archives: survival – astro navigation

Survival – Finding Direction From The Moon.

Posted on March 11, 2016 by Jack Case

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 →

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Survival – The Daytime Star

Posted on February 13, 2016 by Jack Case

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 →

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Survival – Calculating Altitude Without An Angle Measuring Instrument

Posted on April 4, 2014 by Jack Case

Links:  Astro Navigation in a survival situation.    Latitude from the midday Sun.    Find your longitude.     Calculating declination.    Declination table.     Trig table.    Revise trigonometry  Revise Spherical Trigonometry As the above links demonstrate, there are several methods of employing astro navigation … Continue reading →

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What Is The Equation of Time

Posted on April 6, 2013 by Jack Case

The Sun as a Time-Keeper.  Because the Earth’s orbital motion is not uniform, there are corresponding variations in the apparent speed of the Sun as it travels round the earth.   For this reason, the true Sun (the Sun that we … Continue reading →

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How To Locate The Pole Star (Polaris)

Posted on August 29, 2012 by Jack Case

First step – Look in the northern sky to find the constellation Ursa Major which is otherwise known as the Great Bear. Second step – find the Big Dipper (marked in red) which consists of the seven brightest stars of the constellation … Continue reading →

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Astro Navigation In A Survival Situation

Posted on January 8, 2012 by Jack Case

In a recent survey, the majority of people questioned were surprised to learn that astro navigation can be used in a survival situation.  In the same survey, 60% said that they would use satellite navigation systems to find their way … Continue reading →

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Finding Latititude In A Survival Situation.

Posted on January 8, 2012 by Jack Case

The  full method of calculating your latitude from the altitude of the Sun can be found at this link.  However, in a survival situation, the following simplified method can be used. Equipment Needed.  A clinometer or other device for measuring angles. … Continue reading →

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Finding Longitude In A Survival Situation.

Posted on January 8, 2012 by Jack Case

We know that the Earth revolves about its axis once every 24 hours.  In other words, the Sun completes its apparent revolution of 360o in 24 hours.  This means that the Sun crosses each of the 360 meridians of longitude once … Continue reading →

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Latitude from Polaris

Posted on January 8, 2012 by Jack Case

Using The Pole Star (Polaris)  To Find Your Latitude Assume that the Pole Star (Polaris)is exactly in line with the Earth’s axis produced, as shown in the following diagram. To an observer O on the Equator (lat. 0o) the Pole … Continue reading →

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Declination Table For Survival Use

Posted on January 8, 2012 by Jack Case

Sun’s Declination Table constructed for use in survival situations to be used when calculating latitude from the altitude of the midday sun. Provided by Astro Navigation Demystified (www.astronavigationdemystified.com) The following table shows the mean values of the declination of the … Continue reading →

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