Is the sun close to earth?

The sun is approximately 1 AU (149,597,870.7 km. or 92,955,807.27 mi.) from the Earth. Compared to Mercury, the Earth isn't that close to the Sun, but compared to Jupiter or Saturn, it is pretty close.

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That's a fine example of a question to which you can get different answers from

different people, because the criteria used to define it are so arbitrary.

"Close" is a concept that has different meanings in different contexts ... just as

Prof. Einstein so brilliantly expounded in his work on Relativity..

If you live in Chicago, then the sun is 270 thousand times farther from you than Des Moines is,

but 270,000 times closer to you than the next nearest star is.

So in the end, it really depends on what you call "close".