• Sagittarius A*, S62 and S1.

    From Nicolaas Vroom@21:1/5 to All on Wed Apr 28 09:31:25 2021
    Sagittarius A* is considered a large Black Hole at the center of
    the Milky Way. Around this BH a certain number of Stars (or mini
    Black Holes) are circulating. One star is Called S62 which has a
    revolution time of 10 years. A Second Star is called S1 which has
    a revolution time of 166 years, which means that during 1 revolution
    of S1, S62 makes roughly 17 revolutions. As part of my on going
    interest in the movement of stars I have written a program which
    simulates the the movement of maximum of 10 stars around Sagittarius
    A*. What the simulation shows is that during one revolution of S1
    the minimum distance between S62 and Sagittarius A also changes in
    accordance i.e. one cycle. The whole pattern reflects the emission
    of gravitational waves emitted by S1 which influence the behaviour
    of S62. All the stars circulating around Sagittarius A* show that
    same behaviour. The simulation is based on Newton's Law and is
    written in Visual Basic which runs under the 'umbrella' of Visual
    Studio 2019.

    To observe the results of the simulation please select this link: http://users.telenet.be/nicvroom/VB2019%20Sagittarius.program.htm

    It is possible to study the simulation using Zoom if requested.

    Nicolaas Vroom

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  • From Nicolaas Vroom@21:1/5 to All on Tue May 18 19:05:12 2021
    Op woensdag 28 April 2021 om 18:31:27 UTC+2 schreef Nicolaas Vroom:
    Sagittarius A* is considered a large Black Hole at the center of
    the Milky Way.

    Some more details about the simulation of Sagittarius A*
    The simulation is performed in cycles.
    At each cycle, for each object, based on the present velocity and position,
    the acceleration, velocity and position of the next cycle are calculated.
    The time between each cycle (dtime) is 200 seconds.
    The astronomical time is dtime * cycle_number + t0.
    t0 is the astronomical time of cycle 0. Normally set equal to 0.
    Considering the update of all the pixels of a display as a simultaneous
    event, than the update all the positions of all the objects, which all reflect the same astronomical time, are also simultaneous events.
    What this means is that there are no moving clocks involved.
    This means that the algorithm used to calculate the positions etc. does not require the speed of light. This is different for the masses of objects
    which have to be calculated, in advance, based on observations.
    In Newton's case the speed of gravity propagation is set to infinity.
    This also means that gravity forces act instantaneous.

    The calculation of the initial state of the objects at t0 is more complicated. In that case the positions of all the objects involved have to be calculated
    at a sequence of events before t0. What is also important that the time
    when the positions are measured and the time that events take place i.e. the time that objects are at these positions is earlier. The reason is the light travel time, which is the distance between the position of the measurement location
    and the position of the measured event, divided by the speed of light.
    When all that is taken into account the positions at t0 can be calculated
    but also at t-1, t-2 etc.
    Using these positions the masses of the objects involved can be calculated. This is 'rather' simple using Newton's Law but very complicated using GR.

    As already mentioned as part of the simulation no moving clocks are involved i.e. time dilation is no issue.
    The same with length contraction.
    To read more about the universe in 3D, please study this link: http://users.telenet.be/nicvroom/VB%20Universe3D.htm

    Nicolaas Vroom

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