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Loading contentThe Sky Guide helps you observe the real sky. It collects the recurring events and tools that tell you what is visible from where you are — from tonight's planets to the next eclipse. Timing and visibility data will be drawn from authoritative almanac sources.
A guide to what's visible after dark right now.
The Moon's cycle from new to full and back.
When Earth passes through cometary debris streams.
When the Moon passes between Earth and the Sun.
When the Moon passes through Earth's shadow.
Which planets are visible, and where to look.
Spotting the International Space Station overhead.
Tracking comets bright enough to observe.
A running calendar of notable sky events.
Explainers for the events that make people look up.
Solar storms, the solar wind, and their effects near Earth.
The Sun's changing activity — sunspots, flares, and the solar cycle.
The universe, studied with evidence.
A cultural and symbolic tradition — clearly labeled as such.
Tools for the sky — astronomical and traditional.
Definitions, history, and the human context of the sky.
See the universe — through verified, openly licensed imagery.
Learn the sky, step by step.