Astronomy software

Hello all,

I wonder if there are software that would calculate the rate of precession as you move through time, forward and backward. For instance, in about 12 000 years, Vega will be the north star. Are there software that would determine accurately the movements of all stars.

Thanks

Andre

On Fri, 10 Apr 2015 14:56:56 -0700 (PDT), Andre
wrote:

I wonder if there are software that would calculate the rate of precession as you move through time, forward and backward. For instance, in about 12 000 years, Vega will be the north star. Are there software that would determine accurately the movements of all stars.

Essentially all planetarium apps calculate precession and use it for
plotting the sky in the past and future. Keep in mind that the values
used for long time scales are approximations, and not very good ones.
Accurate calculations of precession beyond a couple thousand years in
either direction don't exist.

On Fri, 10 Apr 2015 14:56:56 -0700 (PDT), Andre
wrote this crap:

Hello all,

I wonder if there are software that would calculate the rate
of precession as you move through time, forward and backward.
For instance, in about 12 000 years, Vega will be the north star.
Are there software that would determine accurately the movements of all stars.

Thanks

Andre

Good question. I tried Redshift but the maximum date I could set it
to was 11000AD. And the constellations were the same, and Polaris was
in the same place.

I'm sure there are some programs because I've seen predictions of
where the stars will be and how the constellations will look. But
they might not be commercially available.


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Andre wrote:
Hello all,

I wonder if there are software that would calculate the rate of
precession as you move through time, forward and backward. For instance,
in about 12 000 years, Vega will be the north star. Are there software
that would determine accurately the movements of all stars.

Thanks

Andre

Slellarium is supposed to be OK for 100,000 years for precession but I
don't know about proper motion. It's free for PC and very cheap for phones
and tablets so why not just try it. There are reports on the net of
accurate depiction of Orion at the time the pyramids were built.

On Fri, 10 Apr 2015 23:42:59 +0000 (UTC), Mike Collins
wrote this crap:

Andre wrote:
Hello all,

I wonder if there are software that would calculate the rate of
precession as you move through time, forward and backward. For instance,
in about 12 000 years, Vega will be the north star. Are there software
that would determine accurately the movements of all stars.

Thanks

Andre

Slellarium is supposed to be OK for 100,000 years for precession but I
don't know about proper motion. It's free for PC and very cheap for phones
and tablets so why not just try it. There are reports on the net of
accurate depiction of Orion at the time the pyramids were built.

The earliest pyramids were only built 4600 years ago. The stars
wouldn't have changed much.


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On Fri, 10 Apr 2015 17:12:44 -0600, Chris L Peterson
wrote this crap:


Essentially all planetarium apps calculate precession and use it for
plotting the sky in the past and future. Keep in mind that the values
used for long time scales are approximations, and not very good ones.
Accurate calculations of precession beyond a couple thousand years in
either direction don't exist.

I don't believe you. At the university I went to school at, I was
very familiar with the planetarium. The stars were projected on the
ceiling dome with a globe which had lights attached. The lights were
fixed which could not have provided precession.

Perhaps there are newer types which allow for precession, but I
haven't been into a planetarium in 35 years.


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On Friday, April 10, 2015 at 8:12:59 PM UTC-7, Lord Vath wrote:

The earliest pyramids were only built 4600 years ago. The stars
wouldn't have changed much.

You would be very wrong to believe this. The poles precess 360 degrees every 26,000 years, so 4600 years ago Thuban would have been the pole star, not Polaris...

http://robertbauval.co.uk/articles/articles/cciae.html

On Friday, April 10, 2015 at 10:57:06 PM UTC+1, Andre wrote:
Hello all,

I wonder if there are software that would calculate the rate of precession as you move through time, forward and backward. For instance, in about 12 000 years, Vega will be the north star. Are there software that would determine accurately the movements of all stars.

Thanks

Andre

I wish people would approach the matter with common sense instead of going on an assertion binge .

Here is the alignment of Newgrange which still happens today as it did on the Solstice over 5200 years ago -

https://www.youtube.com/watch?v=KVXWZkwV0RQ

What this means, for people with intelligence to work through these things, is that the position of the North/South poles were in the same position with respect to the Sun and to the circle of illumination 5200 years ago as they are today.If axial precession were true, as it is currently understood, then the ancient alignments of Newgrange and Stonehenge would have been lost many,many centuries ago.

The precession of the Equinoxes has the same root cause as the observation that Sirius skips an appearance by one day after 4 cycles of 365 days. The precession is a consequence of the proportion of rotations to orbital circuits where there is a deficit between the 365 days 5 hours 49 minutes and the idealized timekeeping format of 365 days 6 hours on which the leap day rotation is based. The difference registers in a loss of orbital position or a precessional drift just as Sirius seems to drift back into the Sun's glare over the course of 4 years and highlights the proportion of rotations to orbital cycles. The precessional drift is a further refinement of this principle.

The older astronomers used a framework of the Sun moving through the constellations hence the obstructive nature of axial precession for contemporary purposes. The more productive approach is the apparent motion of the stars behind the Sun thereby accounting for the Earth's own orbital motion and freeing up the perspective where all planets have dual surface rotations to the Sun

https://www.youtube.com/watch?v=612gSZsplpE

About 48 seconds into that time lapse footage the dual rotations become visible.

On Friday, April 10, 2015 at 9:29:53 PM UTC-7, oriel36 wrote:

Here is the alignment of Newgrange which still happens today as it did on the Solstice over 5200 years ago -

https://www.youtube.com/watch?v=KVXWZkwV0RQ

From this page...

http://www.knowth.com/winter-solstice.htm

.... we learn that...

"When Newgrange was built over 5000 years ago, the winter solstice sunbeam would have made its way to the back recess of the central chamber. Due to changes in the tilt of the Earth's axis the sunbeam now stops 2 metres from the back recess."

Get a clue, Gerald, things are NOT the way you think they are...

On Fri, 10 Apr 2015 23:18:37 -0400, Lord Vath
wrote:

On Fri, 10 Apr 2015 17:12:44 -0600, Chris L Peterson
wrote this crap:


Essentially all planetarium apps calculate precession and use it for
plotting the sky in the past and future. Keep in mind that the values
used for long time scales are approximations, and not very good ones.
Accurate calculations of precession beyond a couple thousand years in
either direction don't exist.

I don't believe you. At the university I went to school at, I was
very familiar with the planetarium. The stars were projected on the
ceiling dome with a globe which had lights attached. The lights were
fixed which could not have provided precession.

I'm not sure why you're discussing planetariums. The discussion is
about planetarium software.

That said, precession doesn't change the pattern of the stars, only
their position with respect to the Earth's poles. Plenty of old-style
star ball planetariums could demonstrate precession.

Perhaps there are newer types which allow for precession, but I
haven't been into a planetarium in 35 years.

Most planetarium projectors these days are digital, and can project
any image. These are controlled by planetarium software similar to the
programs we're discussing here, so in addition to precession, they can
also correct for stellar proper motion, and therefore show how well
known constellations have changed their shapes in the past, and will
do so in the future.