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abstraction > mathematical concept > geometrical object > line

line
subject			fact

line	is a kind of geometrical object
	has dimensions 1
	has definition A geometrical object with one dimension

Kinds of line :

• axis (2 facts) - Theoretical straight line through a celestial body, around which it rotates.
• line of apsides (2 facts) - The major axis of an elliptical orbit.
• line of nodes (2 facts) - The intersection between the orbital plane of the Moon or a planet and the plane of the ecliptic.