Another thing I don't understand about rotation speeds is why there is no apparent effect of two constant speeds while orbiting the sun. I've shared this in here before, this guy is interviewing an astrophysicist about some FE questions (under false pretenses.)
Timestamped at the relevant question. He shows her the video of a carnival ride where people are rotating in a circle on a witch's hat, while the whole thing moves back and forth on a half pipe. You feel acceleration and deceleration as you move with, then against the half pipe path while circling on the witch's hat. It's probably easier just to watch the video, the ride is self explanatory and the effects obvious.
So the earth rotates at 1000 mph at the equator, and also moves 66,000 mph around the sun in an elliptical orbit, but no acceleration or deceleration resulting from the two constant speeds is apparent. She says "because gravity" basically:
Guy: Surely with the rotation of the earth, and because it's going around the sun at 66,000 mph, we'd be experiencing deceleration and acceleration...
Astrophysicist: So you want to include all of the velocities involved? Of the earth...
Guy: Just two, the earth's rotation on it's axis 1000 mph, and 66,000 mph around the sun. If you're on the edge of this sphere, like a human being, you would surely be experiencing acceleration and deceleration
AP: Yes, exactly.
Guy: How does astrophysics at your level explain that?
AP: Well it's gravitational forces. So one of rotational forces you have the rotation of the earth, so gravity of earth, and that would...holds Earth together, and when it rotates you experience this acceleration on the edge of the Earth, and the gravity of the Earth. But when the Earth goes around the sun, there is gravitational force towards the center of the sun. So two gravitational forces produce this effect of acceleration and deceleration combination [?]
Guy: But, wouldn't that mean we're not at a constant velocity, so humans should feel the rotation of the Earth?
AP: [long pause] That is interesting.
Guy: It's an interesting one. The astrophysicist I met, he did a model showing that it should show acceleration and deceleration...you can even go on the ISS which is orbiting the Earth, and this should also be experiencing A&D due to the two constant motions, just like the fairground ride.
AP: Right. Well, uh...
Guy: Probably need some homework
AP: Yeah I need some thinking