IS THE LENGTH OF TIME OF ECLIPSE OF MOON, LO, ORBITING JUPITER, THE SAME WHETHER EARTH IS NEAREST JUPITER OR FARTHEST JUPITER?

DOES ANYBODY KNOW THE ANSWER?


jsaldea12

10.5.09

What a conundrum...
Do I attempt to answer the question?
or
Do I ridicule jsaldea12's use of all-caps, lack of prepositions, and hilariously ridiculous question?

The duration of the transits of Io across the face of Jupiter, as well as eclipses by Jupiter, is about the same no matter the distance. But due to the simplest of geometrical effects and the finite speed of light, the timing of the transits happens a few minutes later than average expectation when Jupiter is far from Earth, and earlier than average when Jupiter is near Earth.

But it's not just Io, it is all the satellites of Jupiter (four were known to the crude early telescopes) that sufferred this departure from clock-like regularity.

This basic effect allows estimation of the speed of light as early as the seventeenth century. (Although, perhaps the clocks were not quite good enough at the time for 1% accuracy.)

http://www.amnh.org/education/resources/rf...c/p_roemer.html

But do we know, as observed from earth, the length of time the moon, io, eclipse orbiting Jupiter:

(a) The length of eclipse when earth is nearest Jupiter?
( The lenght of eclipse when earth is farthest Jupiter?


jsaldea12

10.5.09

Yes, we know. And we know that what variability there is (eclipses of Io last 128-138 minutes) does not correlate with distance.

It could be that when Earth is nearest Jupiter, the eclipse of moon io, orbiting Jupiter is 128 minutes

And when earth is farthest Jupiter, the eclipse of moon, io, orbiting Jupiter is 138 minutes.

Is that correct?

Jsaldea12

10.5.09

I said that is not the case. Also, no model would predict such a crazy result, so you aren't doing physics.

You start with facts, then build a model in your head, and ask questions to demonstrate if your head-model is predictive of the universe. But you seem to skip steps one and two, so it's not science.

Yes,. whether earth is near or far from Jupiter, the eclipse of the moon, lo, is the same…the disappearance and the re-appearance. This had been proven hundred of years ago, by Roemer in moon lo, and Huygens in moon, Ganymede. Such is the property of light waves that it projects exactly as is its source, and contact human eyes whole, exactly as is, whether the source of projection is as far as Jupiter or as far as galaxies…the projection is the same, the time of event, the location, complete with colors, sounds, and motion..time may lag light but the projection remains intact.

Regards, Gpenner.


Jsaldea12

106,09