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Old November 1st 17, 07:37 AM posted to sci.astro.amateur
Gerald Kelleher
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Default 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 it’s 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.