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what you see when you look at the speedometer is the average distance you have traveled. notice the speedometer says mph Miles Per Hour how many miles you have traveled per hour.
Your speedometer is broken.
It shows the speed and the distance the car travels.
Because the car is not moving
Look at the speedometer.
A (non digital) speedometer is a damped needle moved by a rotating magnet driven by cable from either the gearbox or one of the wheels.
Speed - but NOT velocity.
You are not moving!
The speedometer.
Speedometer can determine a car's normal and maximum speed.
I assume it's working and you just want to check the calibration of the speedometer. I recommend you use a GPS to check it since those devices have a speed indicator included in their many features. If your speedometer is indicating zero when the car is moving, you likely need a new speedometer. If it's reading zero when the car is moving, try clapping the dash above the instrument to see if the speedometer moves off zero. If it does, then you 100% need a new one. If it doesn't, then you 90% need a new one because you have about a 10%chance that it's the car's speed sensor which might be in the transmission. Not a big deal ($) that, the bigger deal ($$$) would be the speedometer itself.
Because when you look at the speedometer it is telling you your speed at that particular instant in time, it changes from instant to instant.