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Lecture 2

PHYS 183 Lecture 2: Measuring Distance
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Department
Physics
Course
PHYS 183
Professor
Victoria Kaspi
Semester
Winter

Description
Measuring distance Parallax o Technique to measure distance How you measure distance, reason for having two eyes Also called triangulation Objects location changes relative to a distant fixed background depending on viewing angle o 360 degrees in circle o 60 (arcminutes) in degree o 60 (arcseconds) in arcminute o Parallax angle is the angle distance between eachother o 1 parsec=distance of 1 or 200,000 AU (Distance from earth to sun) o p=2 d=0.5 parsecs from us o 0.25=4 parsec o Parsec to lightyear conversion 1pc = 3.26 light years 1 light year = 0.31 pc History o Aristotle (384322 BC) Believed universe could be understood on aesthetic grounds Earth obviously stationary Moon, sun, planets, stars revolve around earth on crystalline spheres
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