Astros
Explore the sky above a place, date and time
Plan what to look for in the sky and understand how your location and the time change what is above the horizon.
Key idea
The horizon belongs to your observing location. A star’s height and direction above it change with time and place, even though its position within a constellation changes far less over an ordinary night.
Try this first
Set your location and choose the current time. Search for the Moon or a familiar star and compare its position with the horizon. Advance time slowly and watch the sky move; then return to Now before planning a real observation.
How to get started
- Choose your location and date, or use your current location and Now.
- Drag to look around; zoom to examine a smaller part of the sky.
- Select a celestial object to read its details. Change the time to follow its movement relative to the horizon.
Explore a little further
Try another experiment
Select one star and move time forward by several hours without changing location. Follow its path relative to the horizon. Return to the original time, change latitude and compare the sky again.
Good to know
Positions depend on location, date and the app’s calculation model. Device tracking depends on sensor support and calibration. Orbital and distance tones are artistic mappings, not sound recorded in space.
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