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Astronomy Calculators

A complete set of astronomical tools

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**Source code available in 'files' area**

This is a page for my collection of calculator utilities, which are being updated all the time. I created them with the aim of helping amateur astronomers with the mundane calculations for optics and telescopes, and for conversions. The program also calculates planetary/lunar ephemerides, orbit properties, and downloads live images of the Sun, satellite tracks and auroral ovals from the internet.

Astronomy Calculators Web Site


  • As seen on the Sky at Night magazine's CD-ROM!
  • Calculate focal ratios and the optical properties of your setup.
  • Calculate planetary and lunar ephemerides, and sunrise/sunset times.
  • Calculate satellite and planet orbital periods.
  • Unveil the true capabilities of your telescope and eyepieces.
  • Easy to use and resource-friendly.
  • Download data easily from the internet.


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Win32 (MS Windows)

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