[Analemma_]

Another classic in the same vein as the linked article is http://people.cs.uchicago.edu/~dinoj/scilies.html, which contains this nugget:

"Correct to within an order of magnitude."

Wrong.

[aj7]

Used to be ok in some branches of astrophysics. Now they know the age of the universe more accurately than any test you’ll get in a hospital. Stay the f—— out of hospitals (and courtrooms).

[davrosthedalek]

It is a joke, but not completely without any connection to reality: Sometimes, in astrophysics, you are happy if you get the order of magnitude correct to an order of magnitude.