Answer:
Solar surface absorbs the radio waves, it does not reflect the radio waves to earth. So the radar can not be used to measure the distance from earth to the sun. However we can use the Kepler' s third law to measure the planet earth's distance from the sun.
Explanation:
If radio signals cannot be returned from the Sun, broadcasting can be used to estimate the distance between both the Sun and earth.
The square of a planet's orbital period is proportional to the inverse of its semimajor axis, per the Kepler's Third Law. Radar is an instrument used to determine the position or motion of a person or object by using reflected radio signals.
If radio signals cannot be returned from the Sun, broadcasting can be used to estimate the distance between both the Earth & Venus, then Kepler's 3rd Law can be used to compute the distance between both the Sun and earth.
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