What did Halley realize could be used to determine the distance between the Sun and Venus?
A similar transit of Venus
A stellar parallax
Eclipses
High energy X-rays
Answer
To determine the distance between the Sun and Venus, astronomers like Halley utilized the phenomenon of transits of Venus, which occur in rare intervals. During a transit, Venus passes directly between Earth and the Sun, appearing as a small dark circle moving across the Sun's face.
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