"Then it's decided. I spoke with your father yestersol. He gave his whole-hearted approval. […]
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. Robert Silverberg), Houghton Mifflin Harcourt (2001), →ISBN, 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.
2011 — Fredrick James Terriere, End of Man, Xlibris (2011), →ISBN, page 530:
Yang had made an announcement yestersol about the upcoming ceremony.
After a slightly slippery start yestersol, Opportunity made it out of "Eagle Crater" on sol 57, which ends at 8:45 p.m. PST on March 22.
2011 —Andrew Kessler, Martian Summer: Robot Arms, Cowboy Spacemen, and My 90 Days with the Phoenix Mars Mission, Pegasus Books (2011), →ISBN, unnumbered page:
Yestersol's plan asked Phoenix to deliver the dirt that was already in the scoop into MECA's optical microscope and wet chemistry lab.