Monthly Archives: April 2014

Distance To The Horizon

Posted on April 20, 2014 by Jack Case

Pythagoras provides us with a method calculating the distance to the horizon. In the diagram below, A represents a ship’s position. B is the top of the lighthouse. B1 is the base of the lighthouse. C is the Earth’s centre. r … 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 →