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Starry, starry night, paint your iPhone blue and grey...

Mastering even the rudiments of astro navigation is still an ambition for me. Its one of those skills that really must be learned through practice – especially practice at sea.

Practical celestial navigation usually requires a marine chronometer to measure time, a sextant to measure the angles, an almanac giving schedules of the coordinates of celestial objects, a set of sight reduction tables to help perform the height and azimuth computations, and a chart of the region. With sight reduction tables, the only math required is addition and subtraction.

Starry, starry night, paint your iPhone blue and grey… → Click here to continue reading →


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