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missions since 1968. In 1991 the IAU began the migration to a relativistic coordinate system and finalized the migration in 2000. Many if not most Earth orbits are also currently calculated with relativistic corrections or methods due to inaccuracies resulting from Earth oblateness and the Lunar perturbation. Voyager would have lacked the fuel to accomplish the grand tour using only
Newtonian Mechanics and some critical functions like Doppler tracking absolutely require relativistic corrections. As the ephemera and flight paths currently require using relativity as current measurement sensitivities are well past the limits of Newtonian Mechanics the claims on this page should be addressed by a subject matter expert.
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Newtonian physics, beginning with the two-body problem. Relativity is not ignored, it is simply put in perspective as correction to be made where high accuracy is needed, such as hitting a 10 meter target circle on the surface of Mars from an Earth launch, which is admittedly harder than bulls-eyeing womprats on
Tatooine, which womprat kills would only hypothetically require Newtonian accuracy, or alternatively the keen eye of a Skywalker. Thus the factual dispute must fall and should be removed.
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and why behind
Celestial Navigation, and specifically why astrolabes work. Celestial Navigation is HOW astrolabes work. The why is of interest to astrophyics, and the how is of interest to sailors. Astrometry is the measurement of the movement of celsetial bodies, which started with planet position observations, and moved into the calculation of the tide tables, moon phases, and the prediction of eclipses, and back to Celestial mechanics for the path of the umbra.
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The factual dispute seems on thin grounds based on current version which states " General relativity is a more exact theory than Newton's laws for calculating orbits, and is sometimes necessary for greater accuracy or in high-gravity situations (such as orbits close to the Sun)." This statement is
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Astrodynamics is how things in space behave, like the three body problem,and the precession of the orbit of
Mercury, and the "dark side" of the moon-locked orbit. Orbital Mechanics was how we got a rocket from escape velocity to orbit. See "Hidden Figures" (2016.) Celestial mechanics is how to how
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Knowledge is not scientific journal and to provide an understanding to a layman of the idea of orbital mechanics, it's not necessary to get into relativistic effects except to note that, in certain high-precision situations, it may be necessary to take relativistic effects into account. This is
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This seems incorrect. It seems like it should state that a satellite will maintain the same angular rotation rate with respect to the fixed stars. Certainly communications satellites can not require a constant expenditure of fuel or increasingly fast reaction wheels to aim their antennae at the
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Additionally, the article does indeed, correctly in my opinion, claim
Newtonian physics is primarily used in this field, true at least for teaching the subject at the graduate physics level. But why rely on me when all you need do is check the work of Richard Battin . Battin's book is all about
620:
The article claim of subject matter (describing the scope of ideas covered by the field of "Astrodynamics") also appears reasonable and credible, even if some of the distinctions seem a little artificial. This is not and should not be taken as a definition of astrodymaics, but as an attempt to
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This page claims that
Newtonian mechanics is the primary method, and that relativistic effects only need to be considered close to the sun. NASA began using JPL's Double Precision Orbit Determination Program (DPODP) in 1968 and relativistic corrections have been applied for lunar and planetary
756:"Explicitly mentioned in the film "Hidden Figures." (2016) is Euler's method, used to find an exact solution for a differential equation. In the film, the method is used to find a solution between two different types of orbit that the capsule moves during its journey from space to earth.
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Apart from the lack of citations, the wording in this section is ambiguous and confusing. Could somebody with more knowledge of the subject clarify matters. I think it's a good thing to have this section, but it's not really serving its purpose with the current wording. Thanks
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correct, in my opinion. (No I am not a subject matter expert, but yes, one of my various degrees is in physics.) The article does not (presently) say that "relativistic effects only need to be considered close to the sun", which would indeed, imo, be incorrect.
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If somebody is wrong or everybody is wrong, or we need the story, or I am a skeptic. I wonder if being a skeptic and self publishing a book is a post modern given free humans rights! Well not in some countries.
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When was the change from using analytical solutions to numerical solutions? It seems that in the early days, even though it seems strange now, NASA used analytical solutions, that is analytical geometry.
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The following article is at the edge of my comprehension. I thought I would post it here so that someone more knowledgeable about the subject would figure a way how to weave it into this article.
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Please don't include animations which cannot be stopped. That triggers migraines for me if I read while the animation is playing. It may have a similar (but more serious) effect on epileptics.
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All of these are rather large fields, since there is a large proportion of amateurs to professionals, a very large body of work gets published, and many many discoveries are made by amateurs.
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There is a recent change from delta-v. As well as I know it, delta-v (spelled out and spoken) is the usual term, but I am not sure enough, and didn't check and references, to change it.
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Orbits are elliptical, with the heavier body at one focus of the ellipse. Special case of this is a circular orbit (a circle is a special case of ellipse) with the planet at the center.
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How do astrodynamics differ from orbital mechanics, celestial mechanics, and the like? There is also astrometry, and I am unsure how these fields differ/related to one another.
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The IAU 2000 resolutions for astrometry, celestial mechanics and metrology in the relativistic framework: explanatory supplement [
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As well as I know it, GR was needed for GPS, not because of the orbits, but because they depend on very accurate (atomic) clocks.
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814:? It seems more likely to me that somebody researching it would want to know about orbits in general, not just artificial ones.
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I am having problems with understanding space, vacuum, and atmosphere. That is aerodynamics versus astrodynamics!
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I was asked to clarify this request. Suggestions of things that might be illustrated or animated:
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already noted in the current revision (801704828, Sept 21 2017) so I'm removing the disputed tag.
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Thus one cannot move from one circular orbit to another with only one brief application of thrust.
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on
Knowledge. If you would like to participate, please visit the project page, where you can join
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on
Knowledge. If you would like to participate, please visit the project page, where you can join
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Do you have a specific question relevant to this article that could be answered better in it?--
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Mathematical formulation of the Double-Precision Orbit
Determination Program (DPODP).
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Proper references would be nice, of course, and these exist and should be added.
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https://aperiodical.com/2018/11/eulers-method-in-structural-engineering/
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Calculating orbits with the Conley-Zehnder index & the Floer number
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Someone who knows how should remove the disputed tag on the article.
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describe the subject matter, and in that it does a fair job, I say.
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Well don't throw at me a whack of equations, as basics is enough.
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A sequence showing initial orbit, transfer orbit, and final orbit.
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redirects here, but surely it would be better off redirecting to
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Equations are not helpful when their terms are not defined.
1161:"Geometers Engineer New Tools to Wrangle Spacecraft Orbits"
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Knowledge level-4 vital articles in
Physical sciences
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443:Knowledge:WikiProject Physics
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332:and see a list of open tasks.
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1159:Sloman, Leila (2024-04-15).
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199:365Â days
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56:get help
29:This is
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362:on the
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259:scale.
126:Google
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