Director / Editor: Victor Teboul, Ph.D.

Looking inside ourselves and out at the world
Independent and neutral with regard to all political and religious orientations, Tolerance.ca® aims to promote awareness of the major democratic principles on which tolerance is based.

Why are some stars always visible while others come and go with the seasons?

By Vahe Peroomian, Professor of Physics and Astronomy, USC Dornsife College of Letters, Arts and Sciences

From Earth spinning on its axis and orbiting the Sun to it precessing like a top, lots of factors affect which stars you can see in the sky.

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