astronomical frame of reference


noun Physics.

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.

QUIZZES

TAKE THIS QUIZ TO SEE WHAT YOU KNOW ABOUT HIGH SCHOOL PUNCTUATION!

Commas mark divisions in sentences. Periods end declarative sentences. Apostrophes show possession. Easy, right? Well, punctuation can get pretty tricky—fast. Think you got what it takes to be a punctuation expert? Take our quiz to prove it!
Question 1 of 10
Which of the options below is the best punctuation for the sentence? It__s your turn to pick the movie __ but your sister gets to pick the board game we _ re going to play.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020