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helicon
helicopter
helicopter gunship
helicopter view
heliculture
helideck
helio-
heliocentric
heliocentric parallax
heliodor
heliograph
heliolatry
heliolithic
heliometer
heliopause
heliophyte
Heliopolis
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heliocentric parallax
he·li·o·cen·tric par·al·lax (plural he·li·o·cen·tric par·al·lax·es)


noun 
Definition:
 
apparent change in astronomical position: the apparent change in position of an astronomical object when viewed from the Earth and the Sun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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