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To: Southack
Calculations for the perihelion of mercury, the advance of the moon's orbit from the tides all use gravity as propagating with c and they are accurate (though it may not be the cause).
Yes, there is always a delay, however if the common motion of the earth and sun affect the gravity or light path, twice a year the apparent position of the sun would be correct as the path is in line with the common motion.
216 posted on 01/14/2003 8:36:15 AM PST by Gary Boldwater
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To: Gary Boldwater
"twice a year the apparent position of the sun would be correct as the path is in line with the common motion."

Perhaps you are thinking in the 2 dimensional model of a flat solar system moving horizontally through space with flat orbits of planets revolving around the Sun inside said System, in which case twice a year the Earth would be in the path of the line in which the Sun was traveling around our Galaxy, however, it still wouldn't be accurate to say that we were seeing the "actual" Sun rather than the Sun in its 8.3 minute old position even in that model (those two cases would point to a location either too far away or too close than the actual position of the Sun).

But that's really not a good model to use in the first place. A better way to grasp the situation might be to envision a flat solar system in which the entire system is moving vertically even as the individual planets revolve horizontally around the Sun.

Now consider that by the time Light travels from the Sun to the Earth, that the Sun has moved vertically 67,728 miles.

Ergo, the actual position of the Sun will be in a different position than what one sees with the 8.3 minute-old Light from it.

218 posted on 01/14/2003 8:48:02 AM PST by Southack (Media bias means that Castro won't be punished for Cuban war crimes against Black Angolans in Africa)
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