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You will also need to know the positions of the stars, i. The Position Angle is the angle from North around to the line you are interested in. There may be a better calculator out there somewhere! I read all of the methods of how to survive in the bush like bear Grylls. And I never heard of this one. Did anyone know what bear Grylls real name is? It took me about five seconds to find that information.
Re finding the South celestial point using the intersection of the line from the pointers and the line of the Crux … A picture would convey in one second what it could take many attempts to, first, understand and, second, accurately implement the written explanation. Thank you for your comments. That is why the post has a simple and clear diagram accompanying it. Please have a look and you should find that it clarifies both the described methods for you.
The Celestial Sphere
I read all these methods here, but the most obvious one that is missing is simply drawing a line between Beta Centauri Hadar and Achernar, and dividing it by two. Yet another, when Achernar is too close to the southern horizon, is to use Epsilon Carinae at the bottom of the False Cross and Alpha Pavonis named Peacock or humorously Pavlova , whose line is similarly divided in half. Actually, Hadar , Achernar, Epsilon Car and Peacock form a celestial cross, whose centre is always the south celestial pole.
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No matter what time of night or part of the year, at least two of these stars can be seen. An isosceles triangle, with the place of the pole between any of the two selected stars, is always at about 90 degrees. All of these work from latitudes of Sydney, degrees, and south of it, finds the south celestial pole. Are you being modest Mr. Lomb, or have you been using your time with the equipment for more nefarious activities? The above post presents two well-known methods of finding south using the Southern Cross.
It is suitable for use in highly light-polluted areas like Sydney and by people who do not have a detailed knowledge of the sky. Daniel Fischer kindly shared another method that may be best suited to darker conditions and for use by people with some familiarity with the sky. Now readers have a choice of methods, which is great. A method I personally found easily understandable, in fact.
Many countries often have unique different methods and perspectives on finding south. Also from Namibia, which is much closer to the equator, using Crux to find south celestial pole year round is not very good because it is not circumpolar. I can understand why using stars closer to the south celestial pole would be desirable because they would be truly circumpolar. In a city like Sydney, we are lucky to see 2nd or 3rd magnitude stars, but the stars by the method you elude are quite invisible. Extensive light pollution in the central city of Sydney is just atrocious, and is now especially poor where Sydney Observatory is located, you are often lucky to see a few dozen stars.
Most observers living is Sydney have to travelon average fifty or sixty kilometres to even get to dark skies to see 6th magnitude, and over one hundred kilometres to seeing the lower 6. It is certainly not like the killer dark skies where you are so luckily observing! There are so many other urban things to use, that doing so would be plainly inane. If some method is to be used it must be memorable to the novice, easy to remember, and universally accepted. Being lost a night I would think that Crux is the best home plate for such methods, which in Australia has been used from the early 19th Century to today.