Heliocentric Parallax

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heliocentric parallax [¦hē·lē·ō¦sen·trik ′par·ə‚laks]

(astronomy)

annual parallax

Heliocentric Parallax

(also, annual parallax), the small angle of the star in a right triangle, in which the hypotenuse is the distance from the sun to the star and the short leg is the semimajor axis of the earth’s orbit. Heliocentric parallax is used to determine distance to the stars: owing to the great remoteness of stars, distances to them may be considered inversely proportionate to the heliocentric parallax.

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