9_7_2


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2. Careful measurement of a celestial object’s position in the sky (astrometry) may be used to determine its distance**


 * define the terms parallax, parsec, light-year


 * gather and process information to determine the relative limits to trigonometric parallax distance determinations using recent ground-based and space-based telescopes


 * explain how trigonometric parallax can be used to determine the distance to stars


 * discuss the limitations of trigonometric parallax measurements


 * solve problems and analyse information to calculate the distance to a star given its trigonometric parallax using: d=1/p