Astronomy Calculator Suite
Explore the sky with free astronomy tools
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Astronomy Calculator Suite - Explore the sky with free astronomy tools

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Astronomy Calculator Suite combines eight free tools for astronomical calculations and observations. Find Sun and Moon times, moon phases, planetary positions, and angular separation. Calculate telescope field of view, light-travel time, stellar magnitude, and orbital periods, or convert calendar dates to Julian dates. It supports multiple units, works in your browser, and requires no signup.

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We built Astronomy Calculator Suite to make useful astronomical calculations accessible without requiring specialized software or separate websites. It started as a simple Sun and Moon calculator, then evolved into a complete browser-based toolkit covering planetary positions, telescope settings, celestial distances, Julian dates, stellar magnitudes, and orbital periods. Our goal was to create one convenient resource for students, educators, amateur astronomers, and curious skywatchers free and without signup.