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The First Known Interstellar Comet
On Tuesday, October 31, 2017 at 10:54:12 PM UTC, Mike Collins wrote:
Gerald Kelleher wrote: On Monday, October 30, 2017 at 9:48:32 AM UTC, Mike Collins wrote: Gerald Kelleher wrote: On Sunday, October 29, 2017 at 9:45:09 PM UTC, palsing wrote: On Sunday, October 29, 2017 at 2:14:04 PM UTC-7, Gerald Kelleher wrote: The chart and the software behind it is a celestial sphere contrivance and totally unlike the new software which will present a stationary/central Sun with everything moving left to right or right to left depending on what celestial object is being considered. For my part you are all welcome to your RA/Dec framework but it is a dead end and utterly devoid of modelling uses even if it is great for predicting events as dates within the calendar system. You mean... you're NOT going to spend time on that web page and learn something new? How sad... A webpage where the Sun not only moves against the background stars but also moves North and South against the same stars !!!!. Despite your sadness, it may comes as no surprise that the new software program will keep the Sun central and stationary thereby allow people to make sense of the motions of faster moving planets (now a relative term). In some ways they already do this but only in brief glimpses - https://www.youtube.com/watch?v=MdFrE7hWj0A Jupiter moves from an evening appearance to a morning appearance as the faster motion of the Earth puts the planet from left to right of the central Sun along with the background stars (in the case of the graphic, ElNath, Castor and Pollucx ) however Jupiter will never pass in front of the Sun as Venus and Mercury are seen to do. Not only will Venus and Mercury show phase changes but also size increases/decreases as they approach and recede from the Earth's wider orbital circumference and position. Showing me manic descriptions of the Sun and planets against the background stars contrasts with the graceful motions that comprise the solar system structure so don't be sad for me. You are so egocentric- in the sense of homocentric but even more. Left and right? In the Southern Hemisphere itβs the other way round. You haven't thought things through but then again when did you ever. In the matter of Venus,the left of the Sun is an evening appearance in both hemispheres and the right of the Sun is a morning appearance in both hemispheres as judgments are made from the orbital motion of the Earth, the orbital motion of Venus and the central Sun. http://www.popastro.com/images/plane...ary%202012.jpg The direction of the Earth's orbital motion is from left to right or counter-clockwise as determined by the annual motion of the stars from left to right of the Sun or alternatively from an evening to a morning appearance - https://www.youtube.com/watch?v=eeQwYrfmvoQ Don't bring a knife to a gunfight Collins. You are welcome to enjoy your homocentric view with your two sticks, a watch and then concluding this is a great way to link daily rotation directly to a whirling sphere of stars but then you lose the ability to model solar system structure and the relative perspectives seen from Earth or from the other planets. Try it yourself, place two sticks in any direction and you will get the same homocentric conclusion but what makes you crowd really, really dumb is that once you recognize RA/Dec as a predictive convenience and not for modelling then you can go your merry way. It is not just about being right but the ability to enjoy astronomy and none of you seem to do that. |
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