How do I change the default font in Calc?

the default font for calc is arial 10. how can I change this default to a different font?

libre office 3.3.4 OOO330m 19(build:401-401-202) tag libre office-,
ubuntu package 1:

Problem solved.

And I’ve updated that answer for LO 4.0.x:

Not actually an answer, just an update to the question. In version Writer lets you change the default fonts from the options menu, no need to muck about with making a template. But Calc doesn’t offer the option, at least that I can find. Is there a simple option to change the default font for Calc or is a new template the only way?