# Respect to what time is calculated in space

This may be the silly question but I have read that time appears to move slower near massive objects because the object's gravitational force bends space-time and the phenomenon is called gravitational time dilation i.e. time moves slower as gravity increases but I want to know how and concerning what time is calculated at a different position of space do time is calculated concerning earth time. Also, since times moves slower as gravity increases this means what

• Does our clock hand move slower there if so how since it depends on the mechanical property or it means ageing of the body?
• Does it depend on the ageing of the body if so how since body ageing depends on the environment and natural things?

I have searched this type of question on the internet but I did not get a proper answer majority of the answer are based on theories and formula but I am looking for an intuitive and rigorous answer.

• "Does our clock hand move slower there if so how since it depends on the mechanical property" - eventually you reach a scale where even "mechanical properties", like the solidity of a pendulum, depend on atomic interactions. In practice, the only way of measuring these effects currently, relies on observing various fundamental processes. The only sensible interpretation appears to be that a gravitational field affects the pace of these fundamental processes, and by doing so in a uniform way, the change is transparent to any attempt to detect it with co-located, co-moving machinery. – Steve Dec 27 '20 at 8:38