Ori = Orion, Air = Aires, CMin = Canis Minor The Bayer designation which is a greek letter assigned to the star.The star names are abbreviated and consist of three parts: These are stars that should be visible from pretty much anywhere, even under light polluted city skies. Using stars for this measurement is probably the easiest and most accurate method of measuring the focal length of a lens focused at infinity, at least for amateurs without access to an advanced optics lab!īelow you'll find a calculator and a list of all the stars that are brighter than 3rd magnitude. If you've arrived at this page by random chance you might be wondering why you'd want to do this and the answer is that you need this information when measuring the focal length of a lens by a method I've described here - Measuring Focal Length. In this article I'll give you the tools to calculate the angular separation between two stars. Ursa Major - a common sight in the northern skies
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