Category Archives: astro navigation

Stars For All Seasons Part 4

Circumpolar Stars In The Southern Hemisphere. In the previous article of this series, we discussed circumpolar stars of the Northern Hemisphere and  in this article we will look at some of the circumpolar constellations in the Southern Hemisphere. Centaurus is the … Continue reading

Posted in astro navigation, Astro Navigation Demystified, astronomy, celestial navigation, navigation | Tagged , , ,

Stars For All Seasons – Part 3

Circumpolar Stars “Know The Stars And You Will Always Have A Compass”.    (Michael Punk. 2002. The Revenant). In article one of this series this article, we briefly touched on the topic of circumpolar stars and here we continue with that … Continue reading

Posted in astro navigation, Astro Navigation Demystified, astronomy, celestial navigation | Tagged , ,

Stars For All Seasons – Part 2

Summer Stars in the Northern Hemisphere  Winter Stars in the Southern Hemisphere “Know The Stars And You Will Always Have A Compass”.    (Michael Punk. 2002. The Revenant) In the last article, we discussed Rotation (the reason the stars seem to rise … Continue reading

Posted in astro navigation, Astro Navigation Demystified, Astro Navigation Topics, astronomy, celestial navigation | Tagged , , ,

Stars For All Seasons Part 1

Often asked questions: Why do the stars seem to rise earlier each night?  Why do the stars that we see in the night sky change from season to season?  There are two separate reasons for these phenomena, Rotation and Revolution. … Continue reading

Posted in astro navigation, Astro Navigation Demystified, astronomy, celestial navigation | Tagged , ,

Accuracy of Sight Reduction Methods.

In my recent article ‘Why Astro‘, I highlighted the risks in using the GPS.  Since writing that article, I am frequently asked “if astro / celestial navigation is to be used, which of the many systems is the best”.  Sight … Continue reading

Posted in astro navigation, celestial navigation, global positioning system, gps, Marine Navigation, mathematics, navigation, spherical trigonometry, trigonometry | Tagged , , , ,

In Defence of Mer Pas

The noon sight for latitude is a method of calculating latitude from the altitude of the sun at the instant it crosses your meridian and for this reason, the method is also known as ‘Meridian Passage’ or ‘Mer. Pas’.  I … Continue reading

Posted in astro navigation, astronomy, celestial navigation, gps, navigation | Tagged , , ,

Celestial Navigation – Theory and Practice

I have received a number of messages asking why my book ‘Celestial Navigation – The Ultimate Course’ is not currently available.  The truth is that I have been spending the winter months revising and updating this book and it will … Continue reading

Posted in astro navigation, astronomy, celestial navigation | Tagged , ,

Why Astro?

In a recent article the discussion centred on our over-reliance on GPS for navigation at sea and the need for back-up systems.  The conclusion drawn was that we already have a back-up system, one that has been tried and tested … Continue reading

Posted in astro navigation, celestial navigation, electronic navigation systems, global positioning system, gps, Marine Navigation, navigation | Tagged , , ,

Astro Navigation in the Forests of the Iroquois

Link: History of the Mason Dixon line Jeremiah Dixon and Charles Mason plotted the famous Mason Dixon Line in 1765, long before the days of GPS or any other electronic navigation equipment. How was it then that they were they able … Continue reading

Posted in astro navigation, astronomy, celestial navigation | Tagged , , ,

Translating A Celestial Position Into A Geographical Position.

This follows the previous post which discussed the Celestial Co-ordinate System. If we wish to use a celestial body’s position in the celestial sphere to help us to navigate on the Earth’s surface, we must be able to translate that … Continue reading

Posted in astro navigation, astronomy, celestial navigation, celestial sphere | Tagged , , , ,