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Tools

Collection of useful astronomy tools, calculators, reference guides and star charts to help with your astronomical observations and astrophotography.

Telescope Calculator
02/06/2010Tools
What's the optimum magnification for my instrument? Is the field of view of a given eyepiece too small to see all of the Moon? Is there a minimum magnification for my scope? What sort of limiting magnitude should I expect with an instrument of a given aperture? You can find answers to all these questions and many more besides with this interactive telescope calculator.
How To Calculate Star Trails
01/05/2009How-To Guides Tools
This star trails tool will give an estimate to how long an exposure you need for star trails to form at a given focal length and target declination.
There are no disasters, only opportunities. And, indeed, opportunities for fresh disasters.Boris Johnson