Category Archives: Topics For Schools

Short Distance Sailing And Rhumb Line Sailing

In my previous post about the meridian passage long method, I demonstrated how the ‘Short Distance Sailing Formulas’ are used to calculate a vessel’s position at meridian passage.  I have since received several questions asking how these formulas allow for … Continue reading

Posted in astro navigation, Astro Navigation Demystified, Astro Navigation Topics, celestial navigation, geometry, Marine Navigation, mathematics, navigation, Schools, spherical trigonometry, Topics For Schools, trigonometry | Tagged , , , , ,

Jupiter’s Retrograde Motion

Jupiter moves across the sky in a very predictable pattern, but every now and then it reverses direction in the sky, making a tiny loop against the background stars – this is Jupiter in retrograde. The following diagram shows that, … Continue reading

Posted in astro navigation, Astro Navigation Topics, astronomy, celestial navigation, Topics For Schools | Tagged , , | 2 Comments