In-depth guides to finding and observing the constellations — covering key stars, mythology, deep-sky objects, and step-by-step tips for first-time observers and experienced stargazers alike.
Each constellation guide on WatchTheStars is written to work at two levels. The first half is designed for complete beginners — how to actually find the constellation on a clear night, what to look for with the naked eye, and a step-by-step observing sequence that makes sense whether you've never looked up at the stars before or you just want a refresher.
The second half goes deeper: key individual stars with their spectral types and distances, mythology from multiple world cultures, every notable deep-sky object in the constellation with difficulty ratings, and an advanced section covering astrophotography targets, telescope challenges, and variable star observation. Each guide also includes original inline diagrams so you don't need to find a separate star atlas.
Click any constellation to open the full guide.
The most recognisable constellation in the night sky. Betelgeuse, Rigel, three Belt stars, the Orion Nebula visible with the naked eye, the Horsehead Nebula, and some of the richest deep-sky territory in the heavens.
Home of the Plough — the most-recognised star pattern in the UK sky. Seven bright stars point the way to Polaris, and the constellation holds seven Messier objects including galaxies M81 and M82.
The most dramatic summer constellation — low in the south from the UK but unmistakable. Red supergiant Antares glows like a hot coal, flanked by globular clusters and the richest Milky Way star fields.
The unmistakable W (or M) shape circumpolar from the UK. Sitting in the Milky Way, it is packed with open clusters including Caroline's Rose and the ET Cluster — and was the site of Tycho Brahe's famous 1572 supernova.
The lion of the spring zodiac, with Regulus anchoring the famous Sickle asterism. Leo holds the remarkable Leo Triplet — three interacting galaxies in one eyepiece view — plus the golden double star Algieba and the annual Leonid meteor shower.
The first sign of the zodiac and home of the First Point of Aries. Though modest in size, it offers the warm-orange giant Hamal and the celebrated double star Mesarthim — one of the first doubles ever resolved by telescope.
Home of two spectacular naked-eye clusters — the Pleiades and the Hyades V — and the orange giant Aldebaran. Taurus also contains the Crab Nebula, the remnant of a supernova seen in 1054 AD.
Two bright stars mark the heads of the celestial twins — orange Pollux and blue-white Castor, a famous sextuple star system. Gemini produces the prolific Geminid meteor shower each December and hosts the rich open cluster M35.
The faintest zodiac constellation, but home to the magnificent Beehive Cluster (M44) — one of the closest and richest open clusters in the sky, visible to the naked eye and spectacular through binoculars.
The second-largest constellation in the sky and gateway to the Virgo Galaxy Cluster — over 1,300 galaxies in one region of sky. Brilliant Spica is the 15th-brightest star in the heavens and a remarkable binary system.
The only inanimate zodiac constellation, once considered the claws of neighbouring Scorpius. Its brightest star Zubeneschamali is one of the few stars in the sky that appears distinctly green to many observers.
Sagittarius points directly at the centre of our galaxy. The Teapot asterism seems to pour steam — the densest star clouds in the Milky Way — and the region holds more Messier objects than any other constellation, including the Lagoon and Trifid nebulae.
One of the oldest constellations in the sky, dating back 4,000 years to Babylonian astronomy. The faint triangular sea-goat is best known for the globular cluster M30 and the naked-eye double star Algedi.
A sprawling zodiac constellation best known for the Helix Nebula — the closest planetary nebula to Earth, nicknamed the Eye of God. Aquarius also produces two annual meteor showers and hosts the rich globular cluster M2.
Two faint fish connected by a cord, marking the location of the vernal equinox — the point where the Sun crosses the celestial equator each March. Home to the Phantom Galaxy M74, one of the most perfectly face-on spirals in the sky.
The constellations visible on a given night depend on the time of year. Here's a rough guide to what dominates the sky from the UK each season.
Orion, Gemini, Taurus, Auriga, Canis Major — the richest bright-star sky of the year
Leo, Virgo, Boötes — galaxy season, with Arcturus and Spica guiding the way
Scorpius (low south), Cygnus, Lyra, Aquila — the Summer Triangle and the heart of the Milky Way
Andromeda, Pegasus, Perseus, Cassiopeia — the Andromeda Galaxy at its highest