For a recent homework assignment in my class on stellar structure and evolution, I was asked to estimate the Prandtl number (the ratio between fluid viscosity and thermal diffusion) in the sun's interior. I came up with an answer of roughly 10^-13. The correct answer to the problem was roughly 10^-8. I still got full credit.
Only in astronomy can one be off by five orders of magnitude and still be close enough to the correct answer to be considered correct.
Yeah, that is funny. That was one thing thing I enjoyed when I took the astronomy courses at BYU. Everything was in terms of Log10 since a "good" answer was close in order of magnitude alone.
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