If you use convection ovens, you will have to bake the potatoes for 45 minutes at 375 F or 60 minutes at 325 F or 90 minutes at 300 F. Convection ovens cook faster than regular ovens so the rule of thumb is to set the temperature in convection ovens at least 25 F lower than you would set in a regular oven.
The Earth's rotation around the sun is a constant. The definition of constant is something that doesn't change or something that continues or remains steady. An example of constant is the earth's rotation around the sun.
1 a constant or variable term in a function that determines the specific form of the function but not its general nature, as a in f (x) = ax, where a determines only the slope of the line described by f (x).  one of the independent variables in a set of parametric equations.