Apogees and perigees

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soul-tyel
2012-03-14
2014-05-29
  • soul-tyel
    soul-tyel
    2012-03-14

    Hi!

    I found that Values ​​Apogees and perigee of the moon are out of step with
    reality.
    (I saw it from the earth-moon distance displayed when the moon is
    selected.)Can you adjust variables easily lunar orbit?
    Would it be possible in the future to view the lunar orbit and its
    intersections with the plane of Earth's orbit?

    I Like Stellarium for years .
    Thanks

     
  • Matthew Gates
    Matthew Gates
    2012-03-14

    Hello. What source are you comparing to?

    The ssystem.ini file should be easy to edit, but finding the correct numbers
    to put in it might be harder.

    M

     
  • Bogdan Marinov
    Bogdan Marinov
    2012-03-14

    The ssystem.ini file should be easy to edit, ...

    No. The only parameters that can be set for the Moon in the ssystem.ini file
    are related to its rotation. The orbit is calculated by a built-in function,
    just like with the rest of the major bodies.

    I think that the problem may be in the way soul-tyel is determining the
    distances. Possible sources of error are time zone differences and rounding
    errors when displaying the distance. Of course, this assumes that such an
    error exists in the first place, i.e. that Apollo 1.3 has a more precise model
    of the Moon's orbit than Stellarium.

     
  • Bogdan Marinov
    Bogdan Marinov
    2012-03-14

    Another possibility is the way Stellarium is measuring distances. I don't know
    if it is "surface-to-surface" or "center-to-center". I have to check in the
    code.

     
  • Bogdan Marinov
    Bogdan Marinov
    2012-03-14

    I think I got it - the distance is the distance between the Moon and the
    observer
    . Do the following experiment:
    - select the Moon
    - stop the time
    - note the distance to the Moon
    - open the Location window
    - click on the map to quickly change the location and note how the distance to the Moon changes. :D

     
  • Mariusz
    Mariusz
    2012-03-14

    The distance is between the centre of each body and the observer, exactly.

     
  • barrykgerdes
    barrykgerdes
    2012-03-14

    The difference between the centre to centre earth/moon distance on my moon
    calculator and the distance given by Stellarium from my location is 4673 km.
    Wrtten in Qbasic from formulae in Astronomy with your PC by Petter Duffet
    Smith

    If I change my location to the northern hemisphere or any other position the
    distance returned by Stellarium varies greatly (1000's of Kms)

    From this I gather the Stellarium distance has been corrected to your location
    on the surface of the earth.

    Barry

     
  • soul-tyel
    soul-tyel
    2012-03-15

    Ok, I realized my mistake .

    In fact , I wish I could use Stellarium to guide me in biodynamic gardening.

    It would be nice to show the orbit of the moon, the dates of Apogee ,of
    perigee and of lunar nodes.

    Thank you all.

     

    • Anonymous
      2014-05-28

      Lunar Perigee and Apogee Calculator
      http://www.fourmilab.ch/earthview/pacalc.html
      Gives you date and UT

       
  • Matthew Gates
    Matthew Gates
    2012-03-15

    For creating calendars and such, I suspect Stellarium is not really the ideal
    tool, since it doesn't (yet) have any sort ephemeris generation features -
    certainly not tabular output anyway.

    It is certainly a nice idea for a plugin though, and might even be possible
    with some sort of script (although it would be very convoluted since the
    script engine doesn't really have suitable output features at present.

    M

     

  • Anonymous
    2014-03-13

    Please tell me there is a way to change the distance measuring method from "observer to centre" to centre to centre" ??

     
  • Bogdan Marinov
    Bogdan Marinov
    2014-03-15

    No, there's no such way.

     

  • Anonymous
    2014-03-31

    well that fucking blows... doesnt matter, failed the lab anyways

     

  • Anonymous
    2014-04-02

    There's scripts for the planets that have Aphelions and Perihelions dates

    Is there a Moon Events script or one maybe in the next revision 0.13 that will do Apogees and perigees?

     

  • Anonymous
    2014-05-28

    I have been trying to figure out why my 11.0 system has Ecliptic Geocentric up in the data box yet my two friends with newer systems don't have the feature. Anyway, in nosing around some discussion groups I came across a post from 2010 or so asking why the Ecliptic Geocentric lunar data was incorrect. The reply was that while Stell had labeled it Ecliptic Geocentric it was actually...forget the term...Ecliptic Topographic? data labeled Ecliptic Geocentric. The questioner ran calcs that confirmed this. I'm wondering if Stell just took the feature off entirely and is there any way to acquire the geocentric data which is what I need. I hope I don't have to go back converting to geocentric from astrology ephemeri. Wondering if this is related to your topic. Fletcher

     


Anonymous


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