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Adoption of the new approach
"Put more plainly, pretend you're Earth, watching Mercury run around a track. As it runs its loop, it will start out moving from the left side of your field of vision to your right. Then, it rounds the corner and, although not moving backward, is now running from right to left. This analogy is oversimplified because it doesn't take into account the fact that Earth is also moving, but it gives a good idea of how this optical illusion plays out.
All of the planets exhibit apparent retrograde motion, although it plays out slightly differently for planets farther from the sun than Earth versus those, like Mercury, that are closer to the sun than Earth." http://www.cbsnews.com/news/the-trut...t-human-lives/ The explanation for inner planetary retrogrades have been more or less out in circulation for a few years so although many errors are expected as in the attempt above, they can be generally straightened out with time. The retrogrades of the outer planets are from an entirely different cause and rely exclusively on relative speeds but this is only one among many different points that partition perspectives as we look outwards or inwards towards the central Sun. It all began in this forum and represents a considerable amount of work in the most hostile conditions but ultimately the insights make it into the popular imagination, even if it takes a planetary transit to bring it into focus. https://www.youtube.com/watch?v=MdFrE7hWj0A |
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Adoption of the new approach
oriel36 wrote:
"Put more plainly, pretend you're Earth, watching Mercury run around a track. As it runs its loop, it will start out moving from the left side of your field of vision to your right. Then, it rounds the corner and, although not moving backward, is now running from right to left. This analogy is oversimplified because it doesn't take into account the fact that Earth is also moving, but it gives a good idea of how this optical illusion plays out. To put it even more plainly imagine you're the sun. All the planets go round you in the same direction. The closer ones move faster. But they always move in the same direction. If you were on one of the planets they will sometimes seem to move backwards but that's just an illusion. |
#3
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Adoption of the new approach
On Tuesday, May 10, 2016 at 10:07:38 AM UTC+1, Mike Collins wrote:
oriel36 wrote: "Put more plainly, pretend you're Earth, watching Mercury run around a track. As it runs its loop, it will start out moving from the left side of your field of vision to your right. Then, it rounds the corner and, although not moving backward, is now running from right to left. This analogy is oversimplified because it doesn't take into account the fact that Earth is also moving, but it gives a good idea of how this optical illusion plays out. To put it even more plainly imagine you're the sun. All the planets go round you in the same direction. The closer ones move faster. But they always move in the same direction. If you were on one of the planets they will sometimes seem to move backwards but that's just an illusion. You are being left behind as the wider population will come to enjoy the looping circuit of the inner planets as seen from a slower moving Earth such as Venus seen over an 18 month period - http://www.popastro.com/images/plane...ary%202012.jpg I cannot be critical of the article which uses the racetrack analogy where a planet 'turns the corner' as it moves out from behind the Sun to its widest point before turning back in front of the Sun but obviously somebody got part of the message that first appeared in this forum and specifically that invaluable animation showing how it appears from the surface of the Earth - https://www.youtube.com/watch?v=MdFrE7hWj0A The looping motions of the outer planets rely on relative speeds between a faster moving Earth and slower moving outer planets hence the 'loop ' perspectives are entirely different for the inner and outer planetary motions where the outer looping motions are an illusion but the inner planetary loop is as real as a car running around a racetrack circuit - http://apod.nasa.gov/apod/ap031216.html http://www.popastro.com/images/plane...ary%202012.jpg Two types of looping motions corresponds to a new approach to observations and clearly the world is prepared to accept this new approach and that give me a great sense of satisfaction. |
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