Question

how do we measure astronomical distances?

Answer 1

Radar is used to measure the distancebetween the orbits of the Earth and of a second body. From thatmeasurement and the ratio of the two orbit sizes, the size of Earth's orbit is calculated. The Earth's orbit is known with an absolute precision of a few meters and a relative precision of a few1×10−11.

Answer 2

to measure astronomical distance a cosmic  distance ladder method is usefull also the parallax method

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