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### 14 Cards in this Set

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 Distance from the Sun resulting from 1 arc second as seen from Earth. PARSEC Unit of measurement for parallax PARSEC Number of degrees in a circle 360 Number of arc minutes in one degree 60 Number of arc seconds in one arc minute 60 Two things the angular size depends upon ACTUAL SIZE, DISTANCE Distance between two points of observation BASELINE The use of three points to calculate distance TRIANGULATION Calculating distance using measured baseline and angles TRIANGULATION or PARALLAX Uses the apparent motion of an object against a background from two viewpoints PARALLAX As the apparent parallax shift increases, the distance to the object... DECREASES As the distance to the object increases, the parallax angle... DECREASES Preferred baseline size LARGE Typical baseline used in astronomy PERIHELION/APHELION or TWO POINTS IN ORBIT