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Thread: real time sky ?

  1. #1
    JimZ's Avatar
    JimZ Guest

    Default real time sky ?



    I was wondering if anyone attempted to make a star map in real time.
    That is, if light from all the bright stars we see at night arrived
    instantaneously. You would need to take into consideration all the
    proper motions and distances, predicted stellar evolutions etc.



    Has this been done ?

    Jim

  2. #2
    Chris L Peterson's Avatar
    Chris L Peterson Guest

    Default real time sky ?

    On 16 Feb 2004 17:39:15 -0800, jss@tricomachine.com (JimZ) wrote:


    I doubt it. That's a lot of work for something with no value other than an odd
    kind of curiosity. Also, all the stars we see with the naked eye are quite
    close, so this synthesized sky isn't going to look very different at all from
    the real sky.

    _________________________________________________

    Chris L Peterson
    Cloudbait Observatory
    http://www.cloudbait.com

  3. #3
    Brian Tung's Avatar
    Brian Tung Guest

    Default real time sky ?

    Jim Z wrote:

    I don't know, but it sure sounds like an interesting idea. I don't
    know if we know stellar ages well enough to factor in stellar evolution,
    but we can do a decent take on the proper motion and distances, at least
    for the nearest stars--the ones that we have decent parallaxes for. The
    neat thing is that the more distant stars have smaller proper motions,
    but because they're further, it takes light longer to get here, and the
    two factors balance each other out. Seems like the difference between
    apparent and "real" location is proportional to the actual linear speed
    at which the stars move across the line of sight.

    I wonder what well-known stars would have unexpectedly high motions by
    this metric?

    Brian Tung <brian@isi.edu>
    The Astronomy Corner at http://astro.isi.edu/
    Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
    The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
    My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.txt

  4. #4
    Sam Wormley's Avatar
    Sam Wormley Guest

    Default real time sky ?

    JimZ wrote:

    Reality includes a finite speed of light!

  5. #5
    Greg Crinklaw's Avatar
    Greg Crinklaw Guest

    Default real time sky ?

    Sam Wormley wrote:

    Yeah, that's what I'd say. This concept of "real time" as applied here
    is pretty much nonsensical.

    --
    Greg Crinklaw
    Astronomical Software Developer
    Cloudcroft, New Mexico, USA (33N, 106W, 2700m)

    SkyTools Software for the Observer:
    http://www.skyhound.com/cs.html

    Skyhound Observing Pages:
    http://www.skyhound.com/sh/skyhound.html

    To reply remove spleen


  6. #6
    JimZ's Avatar
    JimZ Guest

    Default real time sky ?

    >
    O.K. let's call it warped time.

 

 

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