Free Astronomy Calculators and Telescope Utilities

Explore Ontario Telescope’s free astronomy calculators and telescope setup tools, created to help visual observers and astrophotographers achieve better results under the night sky. These practical astronomy utilities make it easier to evaluate double-star visibility, calculate electronic focuser step size, and determine accurate flat-frame exposure settings. Use the Double Star Calculator to explore angular separation, telescope resolution, useful magnification, and the visibility of binary stars before your next observing session. The Focus Calculator helps deep-sky astrophotographers configure an electronic autofocuser for sharper stars, more reliable autofocus runs, and improved image quality. Our Flat Frame Setup Calculator helps astronomy camera users select suitable exposure times, target pixel values, and light-panel brightness for cleaner calibration frames. Whether you use a refractor, reflector, Dobsonian telescope, dedicated astronomy camera, DSLR, or computerized imaging system, these free tools simplify important telescope calculations. Spend less time guessing and more time observing, imaging, and exploring the universe with free astronomy resources from Ontario Telescope.