- Beginner
Interactive sky atlas
Explore the sky like never before: from stars to galaxies, from planets to asteroids.
Resources and tools for amateur astronomy
Latest tools
- ATM
Mirror cell
Design your mirror’s floating cell, from 3 to 54 points, checked in 3D from zenith to horizon, down to the drawing of every part.
- Beginner
What to see tonight?
What to see tonight for your instrument and level, in the order to observe them, each linked to the atlas.
- ATM
- Beginner
Collimating a Newtonian
A Newtonian in 3D: turn the secondary and primary screws and see the effect in the focuser, step by step.
Latest articles
Article
- Beginner
Binocular Skies: 75 objects, each with its chart and star path
75 binocular objects, each with its chart and star path.
Article
The sextant and the nautical almanac: three centuries of celestial navigation
Finding your position by the sky, with our 2027–2035 almanac.
Latest downloads
Binocular Skies
75 objects to find with binoculars, each with its chart and star path
- 13 MB
- 100 pages
- CC BY-NC-SA 4.0
Sun and Moon almanac 2027–2035
The Sun and the Moon month by month, with the correction tables
- 3.1 MB
- 223 pages
- CC BY-NC-SA 4.0