Plan Your Astrophotography Sessions with Precision

The Visibility Calculator is a browser-based tool designed for astrophotographers who want to maximize their imaging time. Simply enter your target object—whether it’s M31, a nebula from the Sharpless catalog, or even a planet—along with your observation location, and the calculator generates a complete visibility profile for the entire year.

The tool shows you exactly when your target rises above your minimum altitude threshold, accounts for twilight conditions, and even factors in moon interference. An interactive altitude plot lets you explore any specific night, complete with twilight shading and optional custom horizon data for your observing site. Animated 2D polar and 3D hemisphere views show exactly how your target moves across the sky throughout the night.

No account needed, no data sent to servers—everything runs locally in your browser with a database of over 12,000 astronomical objects.