New Moon
New Moon
The Moon is invisible from Earth — the darkest skies of the month, ideal for faint deep-sky objects.
Your window to the universe
Discover what’s happening in the sky above you, track cosmic events and explore the universe from your phone.
Coming soon onApp Store
Coming soon onGoogle Play
Right now
What's happening above you tonight?
Tonight
Casablanca
Moon
92%
Waning Gibbous
Venus
Visible now
0° altitude
Saturn
Visible now
1° altitude
Mars
Below horizon
Best after 1:39 AM
Jupiter
Below horizon
Best after 4:06 AM
Stargazing Score
Excellent
Based on Moon and sky conditions only — weather data isn’t connected yet.
Cosmic calendar
Never miss the sky's big moments
Real, computed dates — meteor showers, eclipses, conjunctions and Moon phases, not a fixed illustrative list.
Full Moon
Full Moon
The Moon's entire near side is lit by sunlight — the brightest night of the lunar month.
Meteor shower
Southern Taurids Meteor Shower
Peak rate of up to 5 meteors per hour under ideal dark skies, radiating from Taurus.
Conjunction
Mars – Jupiter Conjunction
Mars and Jupiter appear just 1.2° apart in the sky.
Solar eclipse
Partial Solar Eclipse
The Moon partially covers the Sun's disc.
Lunar eclipse
Penumbral Lunar Eclipse
The Moon passes through Earth's outer, lighter shadow — a subtle dimming.
The full Cosmic Calendar — every category, filtered to your sky — lives in the app.
Get Cosmoss for the full calendarInteractive sky map
Know what you’re looking at
Point Cosmoss toward the sky and discover planets, stars, constellations and deep-space objects — pan, zoom and tap any object for details.
SunMoon
Zoom out
From your backyard to the edge of the observable universe
Earth
12,742 km across
Your home — the only world known to harbor life.
Moon
384,400 km away
About 1.3 light-seconds from Earth — the farthest place humans have visited.
Solar System
~9 billion km across
From the Sun out past Neptune's orbit — about a light-day and a half.
Milky Way
~100,000 light-years across
Our home galaxy, home to 100-400 billion stars.
Local Group
~10 million light-years across
Our galactic neighborhood — 80+ galaxies, including Andromeda.
Observable Universe
~93 billion light-years across
The farthest we can, in principle, ever see.
Solar System
Explore every world, up close
JUPITER
- Diameter
- 139,772 km
- Day
- 9.9 h
- Year
- 11.9 years
- Moons
- 95
- Mass
- 1.90 × 10^27 kg
Jupiter's Great Red Spot is a giant storm roughly 16,500 km across — wider than Earth.
Deep time
13.8 billion years in one journey
13.8 billion years ago
The Big Bang
380,000 years after
First atoms form — the universe becomes transparent to light
~200 million years after
First stars ignite
~400 million years after
First galaxies form
4.6 billion years ago
The Solar System forms
4.5 billion years ago
Earth forms
~3.8 billion years ago
The first life appears on Earth
~300,000 years ago
Homo sapiens emerges
Now
You, reading this
Hypothesis
~5 billion years from now
The Sun becomes a red giant
Hypothesis
Trillions of years from now
One hypothesis: the universe cools toward a “heat death”
A trick of light
Looking into space is looking into the past
Light takes time to travel. The farther away something is, the further back in time you're seeing it.
The Moon
about 1.3 seconds
ago, by the time its light reaches you
The Sun
about 8 minutes
ago, by the time its light reaches you
Sirius
about 8.6 years
ago, by the time its light reaches you
The Andromeda Galaxy
about 2.5 million years
ago, by the time its light reaches you
Inside the app
The real Cosmoss experience
Tonight’s Stargazing Score
87/100
Excellent
20:14Sunset
21:42Astronomical twilight
22:05Jupiter becomes easy to observe
05:52Sunrise
Today
SunMoon
Sky
TimelineCalendar
Full Moon
Aug 28
Perseids Meteor Shower
Aug 12
Mars – Jupiter Conjunction
Nov 16
Partial Solar Eclipse
Feb 17
Events
Tonight
Personalized night-sky information — what's visible, when, and how good the conditions are, right now.
Sky Map
Explore celestial objects with an interactive, pan-and-zoom map of your sky.
Cosmic Events
Never miss meteor showers, eclipses, conjunctions and Moon phases again.
Universe Explorer
Journey beyond the Solar System — from your backyard to the observable universe.
Learn
Understand astronomy and cosmology through clear, scientifically-grounded explanations.
Observe
Plan and record your stargazing sessions, and build your own observation log over time.
The universe is waiting.
Explore tonight’s sky and discover what lies beyond.
Coming soon onApp Store
Coming soon onGoogle Play
Cosmoss is in final development for iOS and Android.