Suppose on a nice December evening you gaze upon your favorite
star. You stick your handout into the sky and point at it, then you
keep your arm fixed and frozen. Until 6 months later when you reach
for the sky again and point at your star with your other arm.
Suppose now you observe the angle you have created with your arms
to be 0.2 degrees . How far is the star from the sun? [hint: assume
the earth orbits in a circular motion around the sun once every 12
month, where the orbit has radius of 149.6 × 10 6km .
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