Sky Map
The Sky Map for your location
The Sky Map represents the visible sky above your location, now or at a time you choose.
- What is that bright point?
- Which constellation is Jupiter in?
- Where does the ecliptic run tonight?
- How high is a star above the horizon?
Stars, planets and the Moon
Bright stars appear as points, while around 2.5 million Tycho-2 stars form the fine background. Planets and the Moon appear at their apparent positions.
Grids that match the sky
Horizontal, equatorial and ecliptic coordinate grids use the true reference systems of the date, matching object positions to the arcsecond.
Physically modelled sky colour
The sky’s colour follows a physical model of Rayleigh and Mie scattering, including ozone absorption. See the colour of twilight represented by the model.
Constellations and orientation
Constellation lines help you find your bearings, while the compass and map rotation align the view with the direction you are looking.
| Grids | horizontal, equatorial, ecliptic (true equinox of date) |
|---|---|
| Stars | 9,110 bright stars and around 2.5 million background stars |
| Sky colour | Bruneton scattering model (2017), adjustable haze |
| Constellation lines | M. van der Sluys, CC BY 4.0 |
Viewing the Sky Map is free. Grids, constellation lines, sky colour, magnitude limits and map rotation are part of the full version.
Frequently asked questions
Can I see the sky at a different time?
Yes, using time travel in the full version.
Does the map include deep-sky objects such as galaxies?
Apphemeride focuses on the Sun, Moon, planets and stars.
How accurate are the coordinate grids?
They are drawn in the true equatorial and ecliptic reference systems of the date, with apparent sidereal time, and match object positions to the arcsecond.
Learn more in the guides
Download Apphemeride
Free to download. The Sun and Moon are always free. Unlock the remaining features with the full version: a one-time purchase after a three-day trial, with no subscription.
