Does anyone recognize the equation carved on this object?
The only hint I have is that the back side has the word "orbit" carved into it.
It may be incomplete or incorrectly copied.
My best interpretation in MathJax:
My grandmother carved the object. She had a hobby of carving small figures and objects out of blackboard chalk. She made (among other things) chess figures and a scene with her brother posing with his new car.
This figure was presumably carved during the space race in the 1960s.
Grandmother was a grade school teacher, so I'm pretty sure she didn't understand it and just copied it from a magazine or newspaper article.