Astronomy 22, Homework 2
Teddy Portney
September 24, 2007
Fall 2007
I. READING
1.) For this week we had to read chapters 2 and 3 in the Sun and Stars textbook. I
found this to be a good way to learn the physics of what happens in the sun. Again, the
pictures used in this book greatly added to the information included in the text. Also this
week, we had to read chapters 8.18.5 in the paperback Swihart textbook. This text was
very difficult to read, as it developed about 4 equations per page with minimal
descriptions of how to use them.
II. DETERMINATIONS
2.) Using the method described in the assignment prompt for this question, I
measured the projected diameter of the sun to be 9 millimeters, to within half a
millimeter. Using the D = d * θ equation, I calculated the angular diameter in radians and
converted this number to arcseconds using the conversion factor of π/648,000 radians per
arcsecond. The values I calculated were 9/1000 radians and 1856.4 arcseconds. Carrying
over my range of uncertainty to arcseconds, I can say that the angular diameter of the sun
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 Fall '07
 Waller
 Astronomy, Solar System, 0.7%, Swihart textbook

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