Know tonight's sky
before you look up.
Sunset and true darkness, the Moon's phase and when it rises, which planets are up and where, a live sky chart and the best dark nights of the coming month. Worked out from the orbits themselves, right in your browser. Free, no account, nothing uploaded.
The sky, calculated.
Cosmic Intelligence computes positions from published orbital elements for the Sun, the Moon (with its main perturbations) and the five naked-eye planets, then turns them into the things an observer actually needs: when it gets dark, whether the Moon will wash out the stars, and what is worth pointing a camera or telescope at.
Moon-free dark hours, to the minute.
Each night is split into civil, nautical and astronomical twilight, then checked against moonrise, moonset and illumination, so you get the longest truly dark window, not just "after sunset".
Planet windows
Mercury, Venus, Mars, Jupiter and Saturn: when each one is above 10° in a dark-enough sky, how high it climbs and which way to face.
30-night planner
Every night of the next month scored for darkness and moonlight, with the best five called out and a CSV for your calendar.
Sky on any date
A birthday, an anniversary, a launch day: the Moon's phase, day length and what was above the horizon, as a shareable report.
Your sky report
Pick a place (or enter coordinates) and a date. Everything is calculated on this device; your location and observing log are saved in this browser only.
Darkness timeline
The Moon
Planets tonight
| Planet | Above 10° from | until | Highest | Face |
|---|
Sky at
Looking straight up: north at the top, east on the left, the edge is the horizon. Bright stars and planets above the horizon are shown.
| Object | Altitude | Direction |
|---|
Score out of 100 from moon-free dark hours and moonlight. Weather is not included; check your local forecast.
Log an observation
| Date | Target | Site | Seeing | Notes |
|---|