To Turn Fast or Slow, That is My Question (1 reply)

I'm a newbie. I want to use a small stepper to slowly tilt a 16" globe to simulate the seasons. Another would spin the globe in real time. The final drives would run indefinitely and extremely slowly. I can program the steppers to rotate the desired excruciatingly slow speeds, or, using gears, run the motors at higher rpm. Currently using an Arduino Uno R3 and cheap 28BYJ-48 with 12v, 1000mA, I notice the motor skips steps when the rpm's are low enough for me to notice. When I spin it fast I don't know if it's skipping. My question is: Do individual stepper motors have an optimum rpm where skipping is least likely, or is there a general rule of thumb for all steppers?

Thanks in advance!
-Matt