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The International Astronomical Union (IAU) recognizes **88 official constellations**. These act as "territories" in the sky, ensuring every star belongs to a specific region.
OFFICIAL LISTNot all patterns are constellations. An **asterism** is a popular pattern within or across constellations, like the Big Dipper (part of Ursa Major) or the Summer Triangle.
PATTERN GUIDEThe **Zodiac** consists of 13 constellations (including Ophiuchus) that lie along the Ecliptic—the apparent path the Sun follows across the sky throughout the year.
ECLIPTIC DATAExplore the official International Astronomical Union (IAU) constellation boundary database. Access precise coordinates mapped across Right Ascension (RA) and Declination (DEC) corners for deep sky navigation and stellar charting.
Open Constellation DatabaseDiscover popular monthly constellations tailored to your exact global coordinates across 10 major regions with small flag icons, save your favorites, track animated text-based XP achievements, and experience a stellar space-themed astronomical journey.
Open Constellation DashboardDesigned especially for polar bear lovers and astronomy enthusiasts, explore the mythology, tracking guides, and optimal viewing times to spot Ursa Major and northern circumpolar constellations in the night sky seamlessly.
Open Polar Bear DashboardStay updated with the latest astronomical discoveries, space mission updates, and community events from HORIZONS. It is an honor to have you join our journey through the stars.