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General Off Topic Almost anything goes! |
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#71
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Yes, in reality the Earth is spinning much faster proportionally to the Moon but the direction is at least correct. If the Earth is rotating at 15 degrees per hour and the Moon at 12.8 per Day relative to a fixed point in space like the Sun around which we are supposed to rotate, you can see that the arc the moon would have to make around the earth to cast a shadow that moves from West to East would be illogical since the Sun is so far away and Moon is so much closer to earth.
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#72
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So where did it come from? Parallel Dimensions, Multiverse theories of infinite possible Universes, Dark Matter, Black Holes.... "Fascinating stuff" said one bacterium to another in a petri-dish as the Professor hung up his lab coat and switched off the lights in the lab.... Last edited by PHC1; 09-11-2017 at 11:29 PM. |
#73
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I was thinking diameter, not radius.
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#74
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One Last Time
unless you want to continue I think the biggest problem in comprehending the explanation for the eclipse traveling from west to east has been the scale of the objects involved. The diagrams posters here and on Youtube have all been way out of scale making the understanding difficult. No matter how capable we are in comprehending the vast distances and sizes, we are INCAPABLE of doing so. Because of this fact, I worked this out to have comprehendible sizes which will make for clear understanding of how the eclipse shadow travels from west to east across the earth surface. SOLAR ECLIPSE EXPLANATION OF WEST TO EAST DIRECTION The earth and moon both rotate in the same direction — counter clockwise — west to east. The diameters are not really important because they are all small relative to distances. I just included them to give additional scale to the project. With the exception of the sun, the diameters of earth and moon are miniscule. Let’s change the units from millions of miles to feet because the millions of miles is hard to comprehend even if you think you can imagine it. 93 million miles = 491 Billion feet. Scale: 1 million miles equals 1 foot Numbers have been rounded slightly for easy math. The results are still within several percent of exact measurements. Easily comprehendible sizes: Sun to earth — 93 million miles = 93 feet Moon to earth — 240 thousand miles = ¼ of a million miles = ¼ foot = 3 inches Sun diameter -- 864 thousand miles = 0.864 feet = 10.4 inches = size of a basketball Earth diameter -- 8 thousand miles = 0.008 feet = 0.096 inches = essentially a pencil point Moon diameter -- 2 thousand miles = 0.002 feet = 0.024 inches = essentially a pinpoint Earth’s rotational speed on axis is about 1000 miles per hour at the equator; one rotation per day. The circumference of the moon’s orbit around the earth is about 1,500,000 miles. 1,500,000 miles divided by one revolution around the earth every 27.4 days yields about 2000 miles per hour. The moon is in a locked orbit around the earth so the shadow travels at the rate of the moon averaging about 2000 miles per hour. Every day we see the moon rise and set one time due to the rotational speed of the earth. The earth rotates about 27.4 times each time the moon revolves once. The umbra (shadow of the total eclipse) actually travels at different speeds at different locations on the earth because the shadow is falling on the earth which is a sphere. The shadow speed is greatest at the beginning and end of the eclipse. (Shine a flashlight at a basketball slowly from side to side and you will see the light move across the surface fastest as the light glances by the sides of the ball and slowest as the light is directly hitting the ball.) Speed of the eclipse: -- very fast in the mid pacific ocean where eclipse begins -- 2410mph in Western Oregon -- 1747mph in central Nebraska -- 1462mph in Western Kentucky -- greatest eclipse -- the midpoint -- 1502mph near Charleston SC -- very fast in the mid atlantic ocean where the eclipse ends The moon revolves about 13 degrees of arc around the earth each day. (360 degrees/27.4 days) The total length of the time of the eclipse from when it starts in the mid pacific ocean until the eclipse ends in the mid atlantic ocean is about five hours. That means that during that period of time the moon subtends an arc of less than three degrees in the sky, which is not very much. (13 degrees/24 hours = 0.54 degrees per hour x 5 hours = 2.7 degrees of arc.) See the link for the entire path of the eclipse from the mid pacific to the mid atlantic oceans. https://eclipse.gsfc.nasa.gov/SEmono.../TSE2017-1.gif Using a comprehendible scale model makes it much easier to see how the moon moves twice as fast as the earth causing the eclipse (the shadow) to extend from west to east. The moon does not have to subtend much of an arc, only 2.7 degrees, or travel far in the sky to do this. I'm sorry, but after much thought, this is the best I can do to explain the path of the eclipse. |
#75
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#76
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Thank you!
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#77
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Besides myself, does anyone else find this Antarctic Wilkins shelf collapse a bit weird? Nature doesn’t do symmetry and 90 deg angles... Those walls are almost 300 ft tall by the way. If not nature then who, how or why?
https://youtu.be/poKX6OnehTc |
#78
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__________________
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#79
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Perhaps but we also should consider exploring that question not from above but from below. Considering the arctic shelves are 3 miles deep and there are 9000 ft mountains and freshwater lakes under them... it all begs the question if we really know what’s under there.
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