AST-027beginner

Constellations & Asterisms: Structures & Vocabulary

A constellation is one of 88 officially defined regions of the celestial sphere, while an asterism is a recognizable star pattern that may be part of one constellation or span several. Constellations are useful for sky navigation, cataloging approximate locations, and organizing observing guides.

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Constellations & Asterisms: Structures & Vocabulary

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AST-026Constellations & Asterisms: Foundations→

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AST-028Constellations & Asterisms: Physical Mechanisms→

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A constellation is one of 88 officially defined regions of the celestial sphere, while an asterism is a recognizable star pattern that may be part of one constellation or span several.

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Patterns arise from projection: three-dimensional star positions are collapsed into angular directions on the sky.

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