Astronomy Resources

Useful tools, calculators, and places to learn more about the night sky. Start with what helps you plan your next observing session, then return when you want to explore something new.

Sky Maps and Observing Planners

• AstroChron — Astronomical events, planet and Moon information, and observing opportunities for your chosen location. Its planetary illustrations appear in the October AstroGuy observing article.
• Stellarium — Desktop planetarium software for exploring constellations, objects, and the sky at a chosen date and time. Stellarium Web offers a browser option.
• TheSkyLive — Object information, positions, and sky charts for planets, comets, and deep-sky targets.
• Telescopius — Target planning and telescope/camera framing tools for astrophotography.
• Mobile Observatory — A mobile astronomy tool for exploring the sky and planetary events. Check the current edition for features and requirements.

Weather and Observing Conditions

• Clear Sky Chart — Astronomy forecasts for supported locations, including cloud cover, transparency, and seeing.
• Weather Underground — General forecasts and local weather information to help plan a session.

Learn and Connect

• NASA Night Sky Network — Find participating astronomy clubs and public events in the United States.
• Astronomical League Club Directory — Locate astronomy clubs by state.
• Cloudy Nights — Community discussions about observing, equipment, and astrophotography.

More from AstroGuy

Find targets in this month’s observing guide, explore the Astrophotography gallery, or read observing stories and practical articles in AstroGuy’s Notebook.

Set the correct location, date, and time in planning tools. Features, pricing, and availability can change, so check each resource directly.