Constellations: The Complete Guide to All 88 Star Patterns

Quick answer: Constellations are the 88 officially recognized regions of the night sky, each named after a mythological figure, animal, or object. The International Astronomical Union fixed the list in 1922 and drew precise boundaries in 1930, so every star you can see belongs to exactly one constellation. About half the names come from ancient Greece; the rest were added by explorers and astronomers between the 1590s and 1750s.

Constellations are humanity’s oldest map — a way of carving the night sky into memorable shapes so we could navigate oceans, time harvests, and pass down stories. Today they do a more practical job: they’re the address system astronomers and astrophotographers use to find anything in the sky. This guide covers all 88 constellations — what each name means, where each one sits in the sky, when to see it, and the story of how a wizard’s hatful of Greek heroes, Dutch trading-voyage animals, and French laboratory instruments ended up sharing the heavens. Star maps included, all free to reuse.

Table of contents

1. What is a constellation?
2. How many constellations are there?
3. Where constellation names come from
4. The complete list of all 88 constellations
5. The zodiac constellations
6. Constellations by season
7. How to find constellations tonight
8. The most famous constellations
9. Constellations and astrophotography
10. Constellations FAQ

What is a constellation?

A constellation is an officially defined region of the sky, not just a connect-the-dots star picture. Modern astronomy divides the entire celestial sphere into 88 territories with precise borders, the way a map divides a continent into countries. The familiar stick figures — a hunter, a swan, a scorpion — are simply the historical patterns those regions were named after.

That distinction matters. When astronomers say the Wizard Nebula “is in Cepheus,” they mean it sits inside Cepheus’s official boundaries — even though it plays no part in the king’s stick figure. And it’s why some famous shapes aren’t constellations at all: the Big Dipper is an asterism, an informal pattern that forms just one part of the larger constellation Ursa Major. The Summer Triangle is another asterism, built from the brightest stars of three separate constellations.

One more useful detail: the stars in a constellation usually have no physical connection to each other. They lie at wildly different distances and only appear grouped from Earth’s point of view. A constellation is a direction, not a place — the stars of Orion range from a few hundred to over a thousand light-years away.

How many constellations are there?

There are exactly 88 constellations, a number fixed by the International Astronomical Union (IAU) in 1922. In 1930, Belgian astronomer Eugène Delporte drew the official boundaries between them, and together they tile the entire sky with no gaps and no overlaps — every point in the heavens belongs to one, and only one, constellation.

They vary enormously in size. The largest, Hydra the water snake, sprawls across 1,303 square degrees — more than 3% of the whole sky. The smallest, Crux the Southern Cross, squeezes into just 68 square degrees, yet it’s so distinctive that it appears on the flags of five nations. Before 1922, star atlases disagreed with each other freely: some listed over 100 constellations, and mapmakers invented and discarded patterns for centuries (a hot-air balloon, a printing office, and a cat all had brief careers in the sky). The IAU’s list ended the chaos, as NASA’s StarChild summary of the 88 constellations explains.

Where constellation names come from

Every official constellation name is in Latin, but the stories behind them arrived in four great waves — and once you know the waves, the strange mix of names suddenly makes sense. Why do a Greek princess, a toucan, and an air pump share the same sky? Because three very different eras each left their signature up there.

Wave one: antiquity. Around 150 AD, the Greek-Egyptian astronomer Ptolemy catalogued 48 constellations in his Almagest, gathering patterns the Greeks had inherited from Babylonian and earlier Mesopotamian skywatchers. These are the celebrity constellations — Orion, Leo, Cassiopeia, the whole zodiac — steeped in Greek mythology: chained princesses, boastful queens, heroes, and monsters. Islamic astronomers such as al-Battani preserved and refined this catalogue through the Middle Ages, which is also why so many individual star names (Betelgeuse, Deneb, Altair) are Arabic.

Wave two: the age of exploration. In the 1590s, Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman charted the deep-southern sky — invisible from Europe — during trading voyages to the East Indies. Their twelve new constellations read like a ship’s naturalist’s diary: a toucan, a peacock, a flying fish, a chameleon, a bird-of-paradise. Mapmaker Petrus Plancius added a few more of his own, including the giraffe and the unicorn.

Wave three: the scientific age. Polish astronomer Johannes Hevelius filled seven gaps in the northern sky in 1687 with small, faint figures like the little fox and the hunting dogs. Then, in 1751–52, French astronomer Nicolas-Louis de Lacaille observed 10,000 southern stars from Cape Town and named fourteen constellations after the instruments of Enlightenment science: a telescope, a microscope, a pendulum clock, an air pump. He also broke up the enormous ancient ship Argo Navis into three manageable pieces — the keel, the stern, and the sails.

A note on the Latin: each constellation also has a genitive (possessive) form used for naming its stars. Alpha Cygni means “the alpha star of Cygnus” — that’s Deneb. Learn that convention once and every star designation in every catalogue makes sense.

The complete list of all 88 constellations

Here are all 88 constellations, grouped by the wave that named them — which is the easiest way to remember what the names mean. “Sky” tells you the hemisphere where each lives (N = northern, S = southern, Eq = straddling the celestial equator, visible from both). “Best month” is when the constellation stands highest on evening viewing around 9–10 pm; from the opposite hemisphere, far-north or far-south constellations may never rise at all.

The 50 ancient constellations (Ptolemy’s 48, with Argo split in three)

These come straight from Ptolemy’s 2nd-century catalogue and carry the mythology: Perseus rescuing Andromeda while her parents Cepheus and Cassiopeia watch, Orion facing the charging bull, the scorpion that killed him placed on the opposite side of the sky. Argo Navis, the ship of Jason and the Argonauts, was later divided into Carina, Puppis, and Vela — which is how 48 ancient constellations became 50 modern ones.

Constellation	Name meaning	Sky	Best month	Worth knowing
Andromeda	The chained princess	N	November	Andromeda Galaxy (M31)
Aquarius	The water-bearer	Eq/S	October	Helix Nebula
Aquila	The eagle	Eq	September	Altair, a Summer Triangle corner
Ara	The altar	S	July	Rich Milky Way fields
Aries	The ram	N	December	Zodiac’s golden-fleece ram
Auriga	The charioteer	N	February	Brilliant Capella; three Messier clusters
Boötes	The herdsman	N	June	Arcturus, 4th-brightest star
Cancer	The crab	N	March	Beehive Cluster (M44)
Canis Major	The greater dog	S	February	Sirius, the night’s brightest star
Canis Minor	The lesser dog	Eq	March	Procyon
Capricornus	The sea goat	S	September	Faint but ancient zodiac member
Carina	The keel (of Argo)	S	March	Canopus; the great Carina Nebula
Cassiopeia	The vain queen	N	November	Unmistakable “W”; Heart & Pacman Nebulae
Centaurus	The centaur	S	May	Alpha Centauri; Omega Centauri cluster
Cepheus	The king	N	October	Home of the Wizard Nebula
Cetus	The sea monster	Eq	November	Famous pulsating star Mira
Corona Australis	The southern crown	S	August	Delicate arc below Sagittarius
Corona Borealis	The northern crown	N	July	Recurrent nova T CrB, the “Blaze Star”
Corvus	The crow	S	May	Compact four-star trapezoid
Crater	The cup	S	April	Apollo’s faint goblet
Cygnus	The swan	N	September	Deneb; North America Nebula
Delphinus	The dolphin	N	September	Tiny, instantly recognizable diamond
Draco	The dragon	N	July	Cat’s Eye Nebula; coils around the pole
Equuleus	The little horse	N	September	Second-smallest constellation
Eridanus	The river	S	December	Winds south to bright Achernar
Gemini	The twins	N	February	Castor and Pollux
Hercules	The hero	N	July	Great Globular Cluster (M13)
Hydra	The water snake	Eq/S	April	Largest of all 88
Leo	The lion	N	April	Regulus; Leo Triplet galaxies
Lepus	The hare	S	February	Crouches beneath Orion’s feet
Libra	The scales	S	June	Once counted as the scorpion’s claws
Lupus	The wolf	S	June	Between Centaurus and Scorpius
Lyra	The lyre	N	August	Vega; the Ring Nebula
Ophiuchus	The serpent-bearer	Eq	July	The “13th zodiac constellation”
Orion	The hunter	Eq	January	Orion Nebula; Betelgeuse and Rigel
Pegasus	The winged horse	N	October	The Great Square
Perseus	The hero who saved Andromeda	N	December	Double Cluster; “demon star” Algol
Pisces	The fishes	N/Eq	November	Faint zodiac ribbon
Piscis Austrinus	The southern fish	S	October	Lonely, bright Fomalhaut
Puppis	The stern (of Argo)	S	February	Packed with open clusters
Sagitta	The arrow	N	September	Third-smallest constellation
Sagittarius	The archer	S	August	Galactic center; Lagoon Nebula
Scorpius	The scorpion	S	July	Red Antares; glorious from the south
Serpens	The serpent	Eq	July	Split in two halves; Eagle Nebula
Taurus	The bull	N	January	Pleiades; Crab Nebula
Triangulum	The triangle	N	December	Triangulum Galaxy (M33)
Ursa Major	The great bear	N	April	Big Dipper; galaxies M81 and M82
Ursa Minor	The little bear	N	June	Polaris, the North Star
Vela	The sails (of Argo)	S	March	Vela supernova remnant
Virgo	The maiden	Eq	May	Spica; the Virgo galaxy cluster

The 12 southern “menagerie” constellations (1590s)

Keyser and de Houtman’s dozen reads like a cargo manifest of wonders from the East Indies trade routes. All twelve sit deep in the southern sky, which is why Europe had no names for them before the voyages.

Constellation	Name meaning	Sky	Best month	Worth knowing
Apus	The bird-of-paradise	S	July	Skirts the south celestial pole
Chamaeleon	The chameleon	S	April	Faint far-southern lizard
Dorado	The dolphinfish	S	January	Hosts the Large Magellanic Cloud
Grus	The crane	S	October	Graceful chain of bright stars
Hydrus	The lesser water snake	S	December	Threads between the Magellanic Clouds
Indus	The Indian	S	September	17th-century naming of distant peoples
Musca	The fly	S	May	Buzzes just south of Crux
Pavo	The peacock	S	September	Its alpha star is named Peacock
Phoenix	The phoenix	S	November	The mythical firebird reborn
Triangulum Australe	The southern triangle	S	July	Brighter than its northern twin
Tucana	The toucan	S	November	Small Magellanic Cloud; 47 Tucanae
Volans	The flying fish	S	March	Leaps beside the ship Argo’s keel

The 5 Renaissance additions (c. 1590–1620)

Mapmaker Petrus Plancius sketched several constellations of his own onto celestial globes, four of which survived, and Tycho Brahe formalized an ancient asterism into a fifth. Two are special: Crux was carved out of Centaurus once navigators realized how useful the Southern Cross was for finding south, and Coma Berenices is the only constellation named after a documented historical person — Queen Berenice II of Egypt, who sacrificed her hair as a votive offering.

Constellation	Name meaning	Sky	Best month	Worth knowing
Camelopardalis	The giraffe	N	February	Huge but remarkably faint
Columba	The dove	S	February	Noah’s dove, south of Lepus
Coma Berenices	Berenice’s hair	N	May	Named for a real Egyptian queen
Crux	The southern cross	S	May	Smallest constellation; on five national flags
Monoceros	The unicorn	Eq	February	Rosette Nebula

Hevelius’s 7 faint northern constellations (1687)

Hevelius mapped the leftover dim patches of the northern sky — and knew exactly how dim they were. He reportedly named Lynx for the sharp eyes you’d need to see it. Scutum, “the shield,” honors King John III Sobieski of Poland, making it the only constellation commemorating a person from its own era.

Constellation	Name meaning	Sky	Best month	Worth knowing
Canes Venatici	The hunting dogs	N	May	Whirlpool Galaxy (M51)
Lacerta	The lizard	N	October	Zigzag “little Cassiopeia”
Leo Minor	The lesser lion	N	April	Faint triangle riding on Leo
Lynx	The lynx	N	March	Needs a lynx’s eyes to spot
Scutum	The shield	S	August	Wild Duck Cluster (M11)
Sextans	The sextant	Eq	April	Hevelius’s own measuring instrument
Vulpecula	The little fox	N	September	Dumbbell Nebula (M27)

Lacaille’s 14 southern instruments (1751–52)

Lacaille’s constellations are a museum of the Enlightenment: precision instruments hung in the southern sky. They answer the perennial trivia question — yes, there really is an air pump, a microscope, and a pendulum clock among the constellations. Mensa, his tribute to Table Mountain below his Cape Town observatory, is the only constellation named after a real geographic place on Earth.

Constellation	Name meaning	Sky	Best month	Worth knowing
Antlia	The air pump	S	April	Honors Papin’s vacuum pump
Caelum	The engraver’s chisel	S	January	Among the faintest of all
Circinus	The drawing compasses	S	June	Tucked beside Alpha Centauri
Fornax	The furnace	S	December	Fornax galaxy cluster
Horologium	The pendulum clock	S	January	Tribute to Huygens’s invention
Mensa	Table Mountain	S	January	Named for a real place; touches the LMC
Microscopium	The microscope	S	September	A dim salute to the laboratory
Norma	The set square	S	July	Dense Milky Way star fields
Octans	The octant	S	October	Contains the south celestial pole
Pictor	The painter’s easel	S	February	Planet-forming star Beta Pictoris
Pyxis	The mariner’s compass	S	March	Completes the ship Argo’s kit
Reticulum	The eyepiece reticle	S	January	Crosshairs Lacaille measured with
Sculptor	The sculptor’s studio	S	November	Sculptor Galaxy (NGC 253)
Telescopium	The telescope	S	August	Of course there’s a telescope

The zodiac constellations

The zodiac is the belt of constellations the Sun appears to pass through during the year, as Earth orbits around it. Twelve are traditional — Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpius, Sagittarius, Capricornus, Aquarius, and Pisces — and they were the ancient world’s calendar: when the Sun “entered” a constellation, farmers and priests knew the season.

Here’s the fact that surprises most people: the Sun’s path actually crosses 13 constellations. It spends about two and a half weeks each December inside Ophiuchus, the serpent-bearer — the “13th zodiac constellation” astrologers ignore. Astronomy and astrology also disagree on dates: because Earth’s axis slowly wobbles (a 26,000-year cycle called precession), the Sun’s position against the stars has drifted by about one whole constellation since the zodiac was invented. The planets and Moon travel through this same belt, which is why they always appear in or near zodiac constellations — a useful fact when you’re learning the layout of the solar system.

Constellations by season

As Earth orbits the Sun, the night side of our planet faces a different direction each season — so the constellations rotate through the year like a slow carousel. For Northern Hemisphere observers, each season has its signature cast:

• Winter (Dec–Feb): Orion, Taurus, Gemini, Auriga, Canis Major — the brightest season of all, anchored by Sirius and Betelgeuse.
• Spring (Mar–May): Leo, Virgo, Boötes, Ursa Major high overhead — galaxy season for telescope owners.
• Summer (Jun–Aug): Cygnus, Lyra, Aquila (the Summer Triangle), Scorpius and Sagittarius low over the southern horizon, with the Milky Way core behind them.
• Autumn (Sep–Nov): Pegasus, Andromeda, Perseus, Cassiopeia — and the Andromeda Galaxy at its best.

Southern Hemisphere observers see the mirror image — Orion in warm December evenings, standing upside down — plus a permanent bonus the north never gets: Crux, Centaurus, and Carina circling the south celestial pole, with the two Magellanic Clouds floating nearby. A handful of far-northern constellations (Ursa Minor, Cepheus, Cassiopeia, Draco, Camelopardalis) are circumpolar from mid-northern latitudes: they never set, wheeling around Polaris all night, all year.

How to find constellations tonight

Start with one anchor pattern and branch outward — that’s how every stargazer before GPS learned the sky. In the north, the anchor is the Big Dipper: its two “pointer” stars aim straight at Polaris (finding you north and Ursa Minor), while following the arc of its handle leads you to Arcturus in Boötes (“arc to Arcturus”) and on to Spica in Virgo (“spike to Spica”).

Three practical tips make the learning curve painless. First, get away from city lights if you can — under a bright urban sky only the brightest stars survive, and the patterns lose their shape (here’s how light pollution affects what you can see and shoot). Second, use a free planetarium app or Stellarium to confirm what you’re looking at in real time. Third, learn constellations in season — meet Orion in January and Cygnus in September, when each is high and unmistakable. A dozen anchor constellations learned this way will orient you anywhere on Earth for the rest of your life.

The most famous constellations

A few of the 88 do most of the cultural heavy lifting. Orion is the sky’s great landmark — visible from every inhabited place on Earth, its three-star belt (the famous “three stars in a row”) points to Sirius one way and the Pleiades the other, and below the belt hangs the Orion Nebula, the finest stellar nursery in the sky. Ursa Major carries the Big Dipper, humanity’s compass. Cassiopeia’s “W” marks the northern Milky Way. Crux, the Southern Cross, does for southern navigators what Polaris does for northern ones. Scorpius actually looks like its namesake — a rarity — and Cygnus flies down the Milky Way trailed by some of the best nebulae in the northern sky.

We’re building dedicated guides to each of these — how to find them, their brightest stars, and the deep-sky treasures inside their borders — starting with the constellations of the current season. Each new guide will be linked from the tables above as it goes live.

Constellations and astrophotography

For astrophotographers, constellations are the filing system of the sky. Every target you’ll ever shoot has an address: the Wizard Nebula lives in Cepheus, the Whirlpool Galaxy in Canes Venatici, the Lagoon in Sagittarius. Learn the constellations and you know what’s shootable tonight, which way to slew, and when each target’s season arrives — the “best month” column in the tables above works for imaging, too.

Constellations also make superb wide-field targets in their own right. A camera on a tripod with a 24–50mm lens can capture an entire figure — Orion with its nebulae glowing, or the Summer Triangle against the Milky Way. Check how much sky your camera and lens actually cover with our free field-of-view simulator, work out exposures with the astrophotography calculator hub, and if you’re just starting out, our astrophotography fundamentals guide walks you through the first steps. When you’re ready to hunt fainter game inside those borders, the Messier catalog is the classic shopping list — and plate solving will center any of it in seconds.

Constellations FAQ

How many constellations are there?

There are 88 official constellations, a list fixed by the International Astronomical Union in 1922, with precise boundaries drawn in 1930. Together they cover the entire sky with no gaps or overlaps, so every star belongs to exactly one constellation.

What is the biggest constellation? And the smallest?

Hydra, the water snake, is the largest at 1,303 square degrees — over 3% of the entire sky. The smallest is Crux, the Southern Cross, at just 68 square degrees, yet it’s bright enough to feature on the national flags of five countries.

Is the Big Dipper a constellation?

No — the Big Dipper is an asterism, an informal star pattern that forms only part of the official constellation Ursa Major, the great bear. Other famous asterisms include the Summer Triangle, the Great Square of Pegasus, and Orion’s Belt.

How many zodiac constellations are there?

Twelve by tradition, but the Sun’s path actually crosses thirteen constellations. Each December the Sun spends about two and a half weeks in Ophiuchus, the serpent-bearer, which the traditional zodiac skips. Precession has also shifted the Sun’s dates by roughly one constellation since antiquity.

Why are constellation names in Latin?

Latin was the shared language of European science when star atlases were standardized, so Greek myths, Dutch discoveries, and French instruments were all catalogued under Latin names. Each name also has a genitive form used to label its stars — Alpha Cygni is “the alpha star of Cygnus.”

Do constellations change over time?

Yes, on two clocks. Precession — Earth’s 26,000-year axial wobble — slowly shifts which stars sit above each point on Earth, so Polaris hasn’t always been the North Star. And the stars themselves drift through space, so over tens of thousands of years the familiar figures will stretch beyond recognition.

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About the author — Hamza is an astrophotographer who has been imaging the night sky since 2008. He operates a remote deep-sky rig at Deepsky Chile (a 12.5″ Alluna Ritchey-Chrétien on a Paramount MX+ with an SBIG STL-11000 camera) under some of the darkest constellation-rich skies on Earth, and shares his work on Instagram @stellar.nomads.

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