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  • orbit - Periapsis or Periastron? - Astronomy Stack Exchange
    The generic word for a celestial body is ἄστρον “Periapsis” would mean “the point closest to the point closest to the body ” Nonsense The proper word is “periastron”: “periapse” is a misconstruction Is the usage of "periapsis" really incorrect or perhaps just a misnomer? Should we replace "periapsis" with "periastron"?
  • orbital elements - Explanation of Longitude of Periapsis - Astronomy . . .
    I'm looking for a mathematical justification of the longitude of periapsis as it makes no mathematical sense to me as a notion By definition, it is the sum of the argument of periapsis and the lon
  • Relationship between Periapsis and apoapsis longitude
    The periapsis and apoapsis are 180° apart According to Kepler's first law, an orbit is an ellipse with the central body at one focus The periapsis (P), central body (F), and apoapsis (A) all lie on the major axis of that ellipse
  • Orbital resonance and the precession of the periapsis
    I was reading up on orbital resonance and came across something on Wikipedia stating that the 1:2 orbital resonance of Io-Europa is quot;imperfect quot; I mean that when you simply take the perio
  • Why doesnt the moon always follow the same path? Or why arent the . . .
    The grammar wasn't correct, but the sense of the question was correct James K edited the title to ask "Why doesn't the moon always follow the same path? Or why is the moon's apoapsis and periapsis fixed?" That edit made the title grammatically correct, but it reversed the intent of the OP Even worse, that edit made the question factually
  • orbital elements - Why is rate of apsidal precession not consistent . . .
    The Wikipedia page on apsidal precession states that the rate of apsidal precession is the first time derivative of the argument of periapsis ($\\omega$), which is related to the longitude of ascend
  • Orbital terminology for satellites relative to one another
    "Periapsis" does not seem to be appropriate as it describes a specific point in a single body's orbit Either a specific word for this phenomenon or a general word for the closest pass between any two bodies would be welcomed A word for the period between these events, adjacent to the concept of lunation
  • orbit - Confused on how you are supposed to calculate eccentricity . . .
    The semimajor axis can now be calculated once you have the specific orbital energy, and characterizes the distance of the extremes of the orbit; For an elliptical orbit, the semi-major axis is half the distance between the periapsis and the apoapsis, and for a hyperbolic trajectory, it is half the minimum distance between the two lobes
  • orbital elements - How can one determine the angle between the line of . . .
    The name for this angle is the Argument of Periapsis The Argument of Periapsis (or in this case, Perihelion, since Mars orbits the Sun) is the angle, in the plane of the orbit, measured in the direction of travel around the Orbit, from the Ascending Node, through the body being orbited, to the periapsis of the orbiting object
  • orbit - Whats the formula for change in argument of periapsis over . . .
    A quick google search gave me the equation for the change in longitude of the ascending node over time, given here, but in the site and also through comparing my model to Celestrak it's very clear that the change in the argument of periapsis over time is also significant





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