read this in a BBC Science article about the Mars exploration:
"We were unaware of [the problem] because of the accumulation that happened during cruise and our 18 sols on the surface."

I certainly can deduce the meaning, but I'm curious about this usage.

here's the url:
http://news.bbc.co.uk/1/hi/sci/tech/3431617.stm


formerly known as etaoin...