Star lore
Cetus
Direct answer
Cetus is a very large equatorial constellation traditionally depicted as a sea creature and spread across the autumn sky.
Cetus is the Sea Monster or Whale, a broad constellation containing the variable star Mira.
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At a glance
- Found in
- Constellations & Star Lore
- Related
- Centaurus, Cepheus, Chamaeleon, Circinus
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The story behind Cetus
Cetus was included in Ptolemy's catalogue and forms part of the classical Andromeda rescue narrative.
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The Road of the Sun
Where the twelve signs came from, and why they carry the names they do.
Why Cetus matters
Mira's dramatic long-period variability made Cetus historically important to the study of changing stars.
Cetus in practice: an example
At favorable maxima Mira can become easy to see, while near minimum it requires optical aid.
Where readings of Cetus go wrong
Mira's brightness is intrinsically variable, so a single finder-chart magnitude may be misleading.
Sources and editorial method
Research references used for this entry include:
- International Astronomical Union: The Constellations - Official names, abbreviations, and boundaries for the 88 modern constellations.
- NASA Space Place: What Are Constellations? - NASA introduction to constellation regions, patterns, visibility, and seasonal sky changes.
- Source
- The Great Almanac Dictionary
- Category
- Constellations & Star Lore
- Last updated
- 2026-09-26
Watch Mira breathe within Cetus
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Common questions
What is Cetus?
Cetus is a very large equatorial constellation traditionally depicted as a sea creature and spread across the autumn sky.
What do people get wrong about Cetus?
Mira's brightness is intrinsically variable, so a single finder-chart magnitude may be misleading.
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