9.7.2 Astrometry Lesson Plenary

(a) Match the definitions to the correct word or term:

____ 1. Parallax A. The amount of energy radiated per second by a body.____ 2. Triangulation B. A method for measuring distances to stars.____ 3. Parsec (pc) C. The apparent shift in an object’s position caused by the

observer’s motion.____ 4. Astronomical unit (A.U.) D.____ 5. Light year (L.Y.) E.____ 6. Luminosity F.

(b) Free response questions

1. How is the parsec defined? How big is a parsec compared with a light-year?

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2.