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It is a what you see is what you get system.We look at an earth-centric system in which the sun, moon, planets, and stars revolve around it.Celestial navigation’s view of the heavens is pre-Copernican.Navigational Astronomy Just four things to remember! If you still do not know your position, do a third sight to get a third circle.Our position would be at one of the intersections of the two circles.If we look at the sun later in the day, we would get a second circle.For example: your plotted track on a chart intersects a circular LOP.An actual position occurs where two lines of position (LOP’s) cross.This is a circular line of position (LOP).Then we would be somewhere on a circle 60 miles (60 nm= 1°) from where the Nautical Almanac said the sun was.But what if the sun were 1° from overhead (sextant reads 89°)?.It measures the angle form the horizon.How do we know that the sun is directly overhead?.Look in the Nautical Almanac to find out where the sun is.Imagine the sun is directly overhead at a particular time.
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- If we have some information we can deduce the rest.
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The basic theory behind Celestial Navigation is that we find our unknown position from a known position.Celestial Navigation Theory, Navigational Astronomy, The Practice R.