Free astronomy and astrology tools
See the sky above any place on any date, find the Moon on the day you were born and draw your birth chart. Every tool is free and calculates the positions for the exact place and time.
The sky
- Night sky on any dateThe Moon, the planets and the stars above any place, from 1900 to 2100.
- Night sky tonightThe Moon, the planets you can see and the time it gets dark in your city.
- Moon phase on your birthdayThe phase and the shape of the Moon on the day you were born.
- Mercury retrograde calendarWhen Mercury and the other planets seem to move backward.
Astrology
- Sun, Moon and rising sign calculatorYour big three, plus your Venus and Mars signs.
- Birth chartEvery planet, the houses and the aspects on one chart wheel.
- Birth chart compatibilityCompare two birth charts and see the aspects between them.
- Zodiac signsThe 12 signs with their dates, elements and ruling planets.
Maps
Put a sky or a street map on a print
Choose a place and a date, and we'll draw the sky above it at that moment. Or choose a city, and we'll draw its streets.
Questions about the free tools
Yes. Every tool on this page is free, and you do not need an account.
We calculate the Sun, the Moon and the planets with Astronomy Engine, an open-source astronomy library, for the exact place and time. We checked the positions against the Swiss Ephemeris, and they agree to a small fraction of a degree.
The sky tools show what is in the sky: where the Moon, the planets and the stars are above a place. The astrology tools use the same positions and place them in the signs of the tropical zodiac, which Western astrology uses. Astrology is a tradition, not a science.
Yes. Choose a place and a date in the editor, and we print the sky above that place at that moment.