What is the actual spatial separation between the Moon and a planet during an apparent close conjunction as viewed from Earth?

Answer

Tens of millions of miles

Although they appear close visually, the actual spatial separation between the Moon (about 239,000 miles away) and a planet like Venus (millions of miles distant) is immense, often measured in tens of millions of miles.

What is the actual spatial separation between the Moon and a planet during an apparent close conjunction as viewed from Earth?
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