Hello, I have a question in GRT. Suppose one is going to obtain the gravitational field of a point mass. He at first sets up a coordinate system. E.G., he may imagine laying out three rods throughout the space and put a clock somewhere. This clock may be put still at the origin of the rods frame or somewhere else. Now my question is, what is the difference?(adsbygoogle = window.adsbygoogle || []).push({});

To put it in another way: suppose we use Swartzchild coordinate system, and then how do know by which clock the coordinate time is taken, just from the form of the metric?

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# What are the meanings of coordinates ?

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