Earth's surface is a common reference point for detecting motion.
The reference point should be stationary, or not moving.
If we're in the realm of newtonian physics I would say that it couldn't be in motion relative to a reference point, of course quantum physics and seems to prove everything we believe wrong.
A landmark - or reference point.
This is called a reference point.
A change in an objects position relative to a reference point is called motion.
Earth's surface is a common reference point for determining position and motion.
reference point
An origin or zero point.
There are various ways to determine motion. The common way is having a reference point and the change from that position is what will determine the motion.
Introduction of motion
Introduction of motion
A Reference Point A reference point is needed to determine if an object is in motion.
A Reference Point A reference point is needed to determine if an object is in motion.
A Reference Point A reference point is needed to determine if an object is in motion.
A Reference Point A reference point is needed to determine if an object is in motion.
Frame Of Reference. which means a framework that is used for the observation and mathematical description
reference point