[CydeWeys]

When I took astronomy, anything within an order of magnitude (10) was considered to be the same number. Calculations are very easy when you're only worrying about the number in the exponent.

[sp332]

Feynman was talking to some students, and he used some historical event as an illustration, but he got the date wrong by a few years and they called him on it. He laughed and said "Hey, three decimal places is pretty good for a theoretical physicist!"

[tamana]

In astronomy, you only need to get the order of magnitude right to within an order of magnitude.

[archgoon]

"Everything is linear if plotted on a log-log plot and with a fat enough magic marker."

- Mar's Law