How do we get ship’s position by star sight ?

These days, there is an enormous amount of information available on celestial navigation. Which means there is also a lot of noise to sift through. And when you do sift through it, you still have to answer one question: How do you apply all of this knowledge practically on board the ship. Talking specifically about star sight, there are tons of resources that deals with the calculation part. Be it Longitude by chronometer or intercept method calculations. Most of us know all these calculations but only that much. But how can we use these to calculate the sight ? In this post, I will show you step wise procedure to use the star sight to calculate your position on board. Let us start. Basics of celestial sight I have covered the basics of the celestial navigation in a different article. You can read this article by clicking on here. And if you have read it you would know that celestial navigation is based on calculation of zenith distance and azimuth of the celestial body. Zenith distance and altitude of the celestial body are inter-related.  Here is the relation. Zenith distance + True Altitude = 90 Degrees.