Star lore
Cassiopeia
Direct answer
Cassiopeia is an official northern constellation whose five prominent stars often appear as a W or M shape.
Cassiopeia is a northern constellation recognized by a bright W- or M-shaped pattern.
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At a glance
- Found in
- Constellations & Star Lore
- Related
- Constellation, Asterism, Zodiac Constellation, Orion
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The story behind Cassiopeia
Cassiopeia’s official name comes from a figure in Greek tradition, while the same stars belong to different stories and practical systems elsewhere.
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Why Cassiopeia matters
Cassiopeia’s distinctive form makes it a useful northern landmark, especially when the Big Dipper is low or obscured.
Cassiopeia in practice: an example
From many mid-northern latitudes, Cassiopeia and the Big Dipper appear on broadly opposite sides of Polaris.
Where readings of Cassiopeia go wrong
The W changes orientation as Earth rotates, and visibility depends on latitude, season, weather, and horizon.
Sources and editorial method
Research references used for this entry include:
- International Astronomical Union: The Constellations - Official constellation names, abbreviations, boundaries, and distinction between regions and figures.
- NASA Science: Skywatching FAQ - NASA guidance on observing stars, planets, constellations, and the changing night sky.
- Source
- The Great Almanac Dictionary
- Category
- Constellations & Star Lore
- Last updated
- 2026-09-26
Find the northern W
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Common questions
What is Cassiopeia?
Cassiopeia is an official northern constellation whose five prominent stars often appear as a W or M shape.
What does the name Cassiopeia mean?
Cassiopeia’s official name comes from a figure in Greek tradition, while the same stars belong to different stories and practical systems elsewhere.
What do people get wrong about Cassiopeia?
The W changes orientation as Earth rotates, and visibility depends on latitude, season, weather, and horizon.
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