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yes·ter·sol (YES·tur·sawl) n.

1. One Mars day ago.

Earliest Citation:

Participating in the science team is fun but has unusual drawbacks. The scientific teams must live on Mars time. A day on Mars is 47 minutes longer than a day on Earth, Crumpler said.

“We’ll basically be waking up in the Mars morning, which will be 47 minutes later each day, and uploading our commands from ‘yestersol,’” he said. “Sol is what a Mars day is called. We’ve had to make a bunch of new terms to deal with Mars time. Of course, we haven’t come up with a name for tomorrow on Mars. We’re open to suggestions.”
—Sue Vorenberg, “Mars Central,” Albuquerque Tribune, December 19, 2003

NASA inventions are the coolest.

[via MarsPhoenix & Word Spy]