Stargazing for Beginners
You don't need a telescope to enjoy the night sky. Learn to tell planets from stars, read the Moon, find the North Star in seconds, and know which constellations are up this season. Check any date's Moon phase with the calculator.
Your first night out
- Pick a night near the new Moon (use the calculator below). A bright Moon washes out faint stars.
- Get away from lights. A backyard works, but a park or rural spot away from streetlights is much better.
- Let your eyes adapt. It takes about 20 to 30 minutes in the dark for your eyes to fully adjust. One glance at a phone screen resets much of that.
- Use red light. A red flashlight, or your phone's red/night mode, lets you read a chart without ruining your night vision.
- Get comfortable. Bring a reclining chair or blanket, warm layers (it gets colder than you expect), and bug spray in summer.
Measure the sky with your hand. Held at arm's length, your little finger covers about 1°, your fist about 10°, and your spread hand (thumb to pinky) about 20 to 25°. Star charts use degrees, so this helps you find things.
Planets vs stars
Stars are distant suns, so far away they look like points. Planets are nearby worlds in our solar system that shine by reflecting sunlight. Five are easy to see with just your eyes: Mercury, Venus, Mars, Jupiter and Saturn.
| Clue | Star | Planet |
|---|---|---|
| Twinkling | Twinkles a lot, especially near the horizon | Usually shines with a steadier light |
| Position | Fixed in its constellation | Wanders against the stars over weeks |
| Path | Anywhere in the sky | Always near the ecliptic, the line the Sun and Moon follow |
| In binoculars | Still a point | A tiny disk; Jupiter shows up to four moons |
- Venus is the brightest thing in the night sky after the Moon. It's never far from the Sun, so look low in the west after sunset or the east before sunrise.
- Mars has a clear orange-red color.
- Jupiter is very bright and steady; Saturn is fainter and a bit golden. Its rings need a small telescope.
- A steady light that moves across the sky in a few minutes is likely a satellite or the space station. Blinking lights are aircraft.
Which planets are up changes month to month. NASA's free monthly “What's Up” guide (in the sources) tells you what to look for.
Moon phases
Half the Moon is always lit by the Sun. As the Moon orbits Earth, we see different amounts of that lit half. The full cycle from new Moon to new Moon (the synodic month) averages about 29.53 days.
| Phase | What you see (Northern Hemisphere) | When it's up |
|---|---|---|
| New Moon | Nothing; the lit side faces away | Up with the Sun |
| Waxing crescent | Thin sliver lit on the right | Evening, in the west |
| First quarter | Right half lit | Afternoon to midnight |
| Waxing gibbous | More than half, growing | Most of the evening |
| Full Moon | Fully lit | All night, sunset to sunrise |
| Waning gibbous / last quarter / waning crescent | Shrinking, lit on the left | Late night and morning |
Memory trick: “waxing” means growing. In the Northern Hemisphere, if the right side is lit, it's waxing. In the Southern Hemisphere it's flipped. And the phases are not caused by Earth's shadow. That's a lunar eclipse, which only happens at full Moon.
How it works: counts days since a known new Moon (Jan 6, 2000, 18:14 UTC) and divides by the average cycle of 29.530589 days. Real cycles vary by several hours, so dates may be off by up to about a day. Uses noon on the chosen date in your time zone.
Find the North Star with the Big Dipper
Polaris, the North Star, sits almost exactly above Earth's North Pole, so it barely moves while the rest of the sky turns around it. Face it and you're facing north. It's not the brightest star, just a medium-bright one, which is why you find it with the Big Dipper.
- Find the Big Dipper in the northern sky: seven bright stars shaped like a ladle (a bowl of four and a handle of three). It's part of the constellation Ursa Major, the Great Bear. It can be high in spring and summer evenings, low in fall and winter.
- Find the pointer stars: the two stars at the outer edge of the bowl, Merak (bottom) and Dubhe (top).
- Draw a line from Merak through Dubhe and keep going about five times the distance between them.
- That's Polaris. It's the end of the Little Dipper's handle.
Bonus: find your latitude. Polaris's height above the horizon, in degrees, is about equal to your latitude. In Miami (about 26° N) it's low; in Seattle (about 47° N) it's about halfway up. Use your fist (10°) to measure.
On the opposite side of Polaris from the Big Dipper is Cassiopeia, a bright W or M shape. When the Dipper is low, Cassiopeia is high, so one of them is usually easy to see from the US.
Constellations by season
Earth's orbit means we face a different part of space at night through the year. The same stars rise about 4 minutes earlier each night, so a season's constellations shift into the evening sky over a few months. The picker shows the highlights around 9 to 10 p.m. from the continental US and other mid-northern latitudes.
Tick what you spot. Your list is saved in this browser only.
Light pollution, apps and binoculars
Light pollution
Outdoor lighting scatters into the sky and hides faint stars. The Bortle scale rates sky darkness from 1 (pristine) to 9 (inner city). From a city you may see only a few dozen stars; under a truly dark sky you can see thousands, plus the Milky Way.
- Even 30 to 60 minutes' drive from a city can make a big difference. Look for a light pollution map or a certified Dark Sky Place from DarkSky International.
- At home, turn off porch lights, and stand where a building blocks streetlights.
- Help science: Globe at Night lets anyone report how many stars they can see.
Apps
Star apps use your phone's GPS and compass: hold it up and it labels what you're looking at. Stellarium is free and open source (on phones, computers and the web); popular alternatives include SkySafari, Star Walk and Sky Tonight. Turn on the app's night (red) mode.
Binoculars before a telescope
Ordinary binoculars are the best first instrument: cheap, easy, and wide enough to find things. Look for 7×50 or 10×50 (magnification × lens width in mm). Prop your elbows or use a tripod to steady them. Try the Moon's craters, the Pleiades star cluster, the Andromeda Galaxy and Jupiter's moons.
Never look at the Sun through binoculars or a telescope, even for a second, and never with your bare eyes. It can permanently damage your eyesight. Solar viewing needs certified solar filters made for that purpose.
FAQCommon questions
Is the North Star the brightest star?
No. Many stars are brighter. The brightest star in the night sky is Sirius, in Canis Major, best seen on winter evenings. Polaris is special because of its position, not its brightness.
Why do stars twinkle?
Turbulence in Earth's atmosphere bends starlight back and forth. Stars are tiny points, so they flicker a lot. Planets show a small disk, which smooths out the effect.
What's the difference between a constellation and an asterism?
The International Astronomical Union recognizes 88 official constellations, which cover the whole sky. An asterism is a familiar pattern that isn't one of those, like the Big Dipper (part of Ursa Major) or the Summer Triangle.
When is the best time to see meteors?
Two reliable annual showers are the Perseids (peak around August 12–13) and the Geminids (peak around December 13–14). Watch after midnight, away from lights, on a night when the Moon isn't bright.
Can I see the Milky Way from my backyard?
Only if your sky is quite dark. In most suburbs it's washed out. On a moonless summer or early fall night at a dark site, it looks like a faint glowing band running through the Summer Triangle down to Sagittarius.