Craig Markwardt wrote in message ...

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Please make the answer to a problem:
" Why the different CELESTIAL MECHANICAL THEORIES have
different so-called
' SYSTEMS of Astrodynamic FUNDAMENTAL CONSTANTS and Parameters '? "
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^

Implicit in the above question is the presupposition that there are
different celestial mechanics theories with different "astrodynamic
constants." What is the basis for this claim?

There are some systems of astronomical constants.
At usage of miscellaneous constants all of them should be
coordinated among themselves and are coordinated with other
data of a problem.
The astronomical constants reflect spatial and time
configurations of actual celestial bodies. The constants are
defined on the basis of observations. Because of inexactness
of measurings always there are indeterminacies in the retrieved
values. There are also dependences between errors of constants.
Some variants are mutual of co-ordinated values can approximately
equally obey to the observational data. The miscellaneous systems
of astronomical constants differ, as a rule, composition
of initial observational data.
The incoordination of accepted values of constants can
introduce in new errors to result of investigations.

Which theories?

In a history of definition of astronomical constants
there were some stable versions. Here some of them:

- the Newcome's System, 1898
- IAU system, 1964
- IAU system, 1976
- DE102 system, 1977
- DE200 system, 1982
- IERS system, 1992
- DE403 system, 1995.

Which constants?


As an example of exact usage of system of astronomical
constants it is possible to give a following situation.
With the help of an DE200 ephemeris the rectangular coordinates
of planets expressed in astronomical units are evaluated.
Then the values of coordinates are translated in kilometers.
Thus for an astronomical unit 149597870.66 kms are possesing
the value, which one differs from value accepted in the IERS
system. And it is correct, as just this value was used at making
ephemerises in system DE200.

And so on with other values of so called " astronomical
constants " from " stable versions" .
" In a history of definition of _astronomical constants_
there were numerous of systems of stable versions... "

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The gravitational astronomy or different celestial mechanics
theories are an amazing example

of guessing on numbers, i.e. numerology ;^)
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