Stargazing planner
Tonight's sky
When it gets dark where you are, what the Moon is doing, which bright planets are up and when the International Space Station passes over. Everything is calculated in your browser for the place you choose.
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Sources and method
- City list: GeoNames dataset of larger towns and capitals, licensed under CC BY 4.0.
- Sun, Moon and planet positions: Astronomy Engine by Don Cross.
- ISS orbital elements: CelesTrak GP data for NORAD 25544, propagated with satellite.js (SGP4).
- Time zone from your location: tz-lookup, run on your device.
Times cover local noon to the next local noon. Positions are sampled every minute (every 10 seconds for the ISS) and start and end times are refined to about a second. A planet counts as visible when the Sun is more than 6° below the horizon and the planet is more than 10° above it. These are geometric predictions: clouds, haze, trees, buildings and light pollution are not taken into account. More practical guidance is in our stargazing coverage.