HELIOCENT'RIC, adjective [Gr. the sun, and center.]

The heliocentric place of a planet, is the place of the ecliptic in which the planet would appear to a spectator at the center of the sun.

The heliocentric latitude of a planet, is the inclination of a line drawn between the center of the sun and the center of a planet to the plane of the ecliptic.

Helioid parabola, in mathematics, the parabolic spiral, a curve which arises from the supposition that the axis of the common Apollonian parabola is bent round into the periphery of a circle, and is a line then passing through the extremities of the ordinates, which now converge towards the center of the said circle.