Your guide to Celest
Find your way around the night sky
Start with one easy target, learn to read the sky, and build the confidence to plan your own nights outside.
Your first night outside
One good look is a good start.
You do not need to know the whole sky. Pick one visible thing and learn how to find it.
- 1
Check your sky
Set your location, then check clouds, darkness and moonlight before you go.
Check conditions - 2
Choose one easy target
Use the sky map to find a bright planet, the Moon or a recognisable star pattern that is visible from your location.
Find your first target - 3
Plan your next night
Choose an event in the calendar. Check its date, local viewing time and equipment before making plans.
Open the calendar
Choose what interests you
Learn something you can try tonight.
Open a guide for the essentials, then put it into practice.
Start with the MoonPhases, moonlight and when to look.
- Check the phase and rise/set times for your location. The Moon is not above the horizon all night.
- To observe the Moon itself, choose a time when it is above your horizon and clouds allow a view.
- For faint stars and galaxies, check when the Moon is below the horizon in Darkness & Moon.
Find your first planetA point of light, then a closer look.
- Open Planets to see what is actually visible tonight; a familiar planet may be below the horizon.
- Use its direction and viewing window to know where and when to look. The sky map helps you match it to nearby stars.
- Seeing a planet with the naked eye does not mean seeing surface detail. Check the equipment advice on its page.
Learn one constellationUse a few bright stars as landmarks.
- Pick a constellation from tonight's list, rather than trying to learn the whole sky at once.
- Check its direction, then find its brightest stars. Compare their spacing and shape with the map.
- Constellation lines are only a guide. You will see separate stars, and city light can hide the fainter ones.
Watch a meteor showerChoose the night and keep a wide view.
- Check the shower's peak date and the viewing advice for your location in the calendar.
- Clouds, moonlight and city glow affect how many meteors you can see. A peak date is not a promise of a clear night.
- Use your naked eyes for a wide view. Read the shower guide for timing and where to look.
Go beyond bright starsClusters, nebulae and galaxies.
- Start with the easiest targets in Deep sky and choose the equipment you actually have.
- Check the recommended viewing time and whether the target needs binoculars or a telescope.
- Faint objects need darker skies. Bright Moonlight and city glow can hide them even when the sky is clear.
Find a better observing nightClouds, moonlight and city glow.
- Use Conditions to see what helps or limits your view. Clear weather and a dark sky are separate things.
- A lower Bortle class means a darker sky. Check nearby places, then confirm access and local conditions.
- For the Milky Way and aurora, use Live sky for a specific planning estimate and read what the score means.
THREE THINGS TO KNOW
Read the sky
Interactive examples, not tonight’s forecast.45° above the horizon
Altitude is how high to look, not how far away something is.
45° is halfway from the horizon to directly above your head.
Keep the useful words
Astronomy, in plain language.
A short explanation and why it matters when you look up.
Twilight
The period after sunset or before sunrise when the Sun is below the horizon but the sky is not fully dark.
Why it mattersFaint stars become easier to see as twilight progresses from civil to nautical and then astronomical.
Astronomical night
The darkest part of the night, when the Sun is at least 18° below the horizon.
Why it mattersThis is usually the best time for galaxies, nebulae, faint meteors, and the Milky Way.
Golden hour
The warm, soft-light period close to sunrise or sunset. It is beautiful for photography, but the sky is too bright for stargazing.
Why it mattersIt helps photographers plan, while stargazers know they still need to wait for darkness.
Light pollution
Artificial light from streets, buildings, and cities that makes the night sky brighter.
Why it mattersMore light pollution means fewer stars and much less detail in galaxies, nebulae, and the Milky Way.
Bortle class
A scale from 1 to 9 describing how dark the sky is. Class 1 is extremely dark; class 9 is a bright inner-city sky.
Why it mattersIt gives you a realistic limit for what can be seen even when the weather is perfect.
Magnitude
A brightness scale used for stars and planets. Lower and negative numbers mean a brighter object.
Why it mattersA planet at magnitude −2 is much easier to see than an object at magnitude +6.
Moonlight impact
The amount of natural sky glow created by the Moon during your observing time.
Why it mattersA bright Moon can hide faint stars even when there are no clouds and you are far from a city.
Planetary opposition
The moment when a planet appears opposite the Sun in our sky.
Why it mattersThe planet is often near its brightest, rises around sunset, and remains visible for most of the night.
Before you head outside
A few things worth knowing.
Do I need a telescope to start?
No. Begin with the Moon, bright planets and constellations. Celest marks equipment needs on target and event pages, so you can choose something suitable before buying anything.
Browse easy targetsWhy is the forecast good but I still see very little?
Clouds are only one part of the picture. Moonlight, city glow, haze and a blocked horizon can still limit the view. Check the individual explanations in Conditions before choosing a target.
See what affects visibilityWhich times should I follow?
Use the times shown for your selected location. Change the location if you travel; an event's date does not mean it is visible everywhere or all night.
Plan a local eventMake Celest comfortable to read.
Simple keeps the essentials. Detailed adds extra readings where available.