Determine the diameter of the star Omicron Ceti in kilometers with an apparent angular diameter of 0.065 “and a parallax of 0.024”.

The parallax of a star is the angle at which the radius of the earth’s orbit is visible from a distance separating the Sun and a given star. The angular diameter of a star is the angle at which the diameter of the star is seen from the same distance. Therefore, the diameter of the star is (0.065 / 0.024) = 2.7 AU. or 405 million km.

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