Why is it geology = geologist and astronomy = astronomer, not astronomist?

Question

I need a valid explanation on why astronomy = astronomer not astronomist or geology = geologist not geologer

Answer 1

There is no logical reason, other than that is what it is.

Answer 2

It works that way for different kinds of criminals too. Why rapist and not raper? Why robber and not robbist?

Answer 3

The correct analogy would be astrologist not astronomist. The title "astrologist" is already taken by, well, astrologists.

Edit: The person who have me thumbs down should be put down, preferibly gassed. Have you ever heard about the suffx "logist" attached to countless scientific fields? This is no different, moron. Astro+logist=astrologist, geo+logist=geologist. But the word astrologist is already taken so we have to use something else.

Answer 4

For the same reason you see flocks of geese but you very rarely see herds of meese.

Answer 5

i get misty.......rflmao