[raybbr]

Just having fun here. This was bolded in your reply: and on Oct. 20, the comet will make its closest approach to Earth since its discovery.

Harrumph! Ha!

Exactly 39 years ago it came a lot closer.

Don't ask me how I know.

Okay, I'll tell you according to web site Hartley was only .084 AU from earth. This year it's scheduled to pass at .12 AU from earth.

AU = Astronomical Unit 92,955,807 miles.

[IYAS9YAS]

Yeah, but gold (AU) wasn’t worth as much back then... ;-)

[IYAS9YAS]

Okay, I'll tell you according to web site Hartley was only .084 AU from earth. This year it's scheduled to pass at .12 AU from earth.

That 0.084 AU was from Hartly to Jupiter.