Yestersol

Origin

- + sol("Martian day"), by analogy with yesterday.

Full definition of yestersol

Adverb

1. On the sol before the present one.
• 2001, Mary Turzillo, "Mars is No Place for Children", in Nebula Awards Showcase 2001: The Year's Best SF and Fantasy Chosen by the Science Fiction and Fantasy Writers of America (ed. ), Houghton Mifflin Harcourt (2001), ISBN 9780151005819, page 61:But yestersol he took Mother into the old middle-pressure greenhouse (the little one they built when they first arrived here) and got her involved in a long discussion.

Noun

1. The sol before the present one.
• 2003, Sue Vorenberg, "Mars Central", Albuquerque Tribune, 19 December 2003:"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.