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astronomical frame of reference

American  

noun

Physics.

  1. a frame of reference in which the sun or center of mass of the universe is fixed and which does not rotate with respect to the fixed stars.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.