LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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1.5 The parsec is a distance used in astronomy, defined to be a
distance from the sun such that “the heliocentric parallax is
1 second of arc.” This means that the direction of
observation of an object from the sun differs from the
direction of observation from the earth by one second
of arc.
a. Find the value of 1 parsec in kilometers. Do this by
constructing a right triangle with one side equal to
1 parsec and the other side equal to 1.49599×108 km,
the distance from the earth to the sun. Make the angle
opposite the short side equal to 1 second of arc.
b. Find the value of 1 parsec in light-years.
c. Express the distance from the earth to the sun in parsec.
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