How Big is a Light Year?
Lets you examine the size of a light year and travel times to astronomical objects. Last updated 27 November 2019 |
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Telescope Circles
A collimation aid for mirror telescopes. It provides two adjustable concentric circles that you can lay over a defocussed image of a star to ensure that the silhouette of the secondary mirror is exactly centered within the bright image of the primary mirror |
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Bahtinov
Mask Guide A simple resizeable and rotatable overlay for centring the middle spike between the two outer X spikes of a Bahtinov mask image |
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Night Vision Saver A variable intensity rubilith simulation that can be used to cover all / part of your computer screen to preserve night vision after dark. |
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Electronic Orrery
An electronic version of the orreries that were popular long ago. Fun to use but does not compare in accuracy or graphic sophistication with modern planetarium programs. Very suitable for introducing youngsters to the mechanics of the Solar System. |
Please be aware that this application was created some years ago and it does not run properly on computers for which the regional setting requires a comma for the decimal point and periods for thousands separators when displaying numerical values. Thus regrettably users in continental Europe, etc. would need to change their regional setting to (say) English (USA) before opening the application.
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