Caroline Herschel

She is an astronomer, May:

Caroline Lucretia Herschel

1750-1848

Born in Hanover, Germany, Caroline Herschel worked in the United Kingdom with her brother, William Herschel. She developed methods of exploring the night sky, helped in the construction of telescopes, studied binary star systems, and published important stellar catalogs. She was named an honorary member of the British Royal Astronomical Society and received the gold medal of science from the King of Prussia. British King George III paid her a salary of 50 British pounds, making her the first professional female astronomer in history.

She discovered eight comets, three nebulae, and wrote two astronomical catalogs.

Before becoming an astronomer, she was a famous singer at oratory concerts.

On the calendar there's also a black-and-white portrait, presumably from her own time, and a modern sketch.

Her Wikipedia article (which could do with some proof-reading, and deciding whether to call her brother Wilhelm or William) has a lot more detail, including that an asteroid and a crater on the Moon were named after her, and a lot more on her work ... though mostly describing her as assisting her brother, and after he died, her nephew John Herschel (whose article doesn't mention her). Humph!

The Wikipedia article also talks about the effects of typhus: This disease stunted Caroline’s growth and she never grew past four foot three. Due to this deformation, her family assumed that she would never marry ... and later, However she did not remain a servant or a maid as her mother wanted either. I think "wanted" is some major conclusion-jumping! How about "expected"?