How often is Halley's Comet visible from earth?

Answer

Halley's Comet or Comet Halley is the best-known of the short-period comets, and is visible from Earth every 75 to 76 years. Halley is the only short-period comet that is clearly visible to the naked eye from Earth, and thus the only naked-eye comet that might appear twice in a human lifetime.
Q&A Related to "How often is Halley's Comet visible from earth..."
Halley's comet becomes visable every 76 years.
http://wiki.answers.com/Q/How+often+do+the+two+fam...
Haley's comet comes by earth every 76 years. It will come again in
http://www.chacha.com/question/how-often-is-halley...
I think you are assuming an aspect angle of 90 degrees, so that you're looking at the tail broadside. You don't really need to use an approximation. L = 2d tan(θ/2) d = 0.7
http://answers.yahoo.com/question/index?qid=201304...
The next time Haley's Comet will be visible will be the year 2061, predicted date is July 28th. It is only visible every 75-76 years.
http://www.kgbanswers.com/how-long-until-haleys-co...
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