Physical and astronomical constants

2013 ◽  
pp. 608-609
Author(s):  
George Greenstein
Keyword(s):  
Astronomical Constants

scholarly journals Relationship between the system of Astronomical constants and the radar determinations of the Astronomical Unit

1965 ◽  
Vol 21 ◽  
pp. 153-175
Author(s):  
D. O. Muhleman
Keyword(s):  
Error Analysis ◽  
Astronomical Unit ◽  
Astronomical Constants

This paper is devoted to an exact discussion of the determination of the astronomical unit with radar and to an extensive error analysis of the technique. Theoretical relationships between the constants are used to construct a consistent set of numerical values of constants based on these results.

On the new system of astronomical constants

1965 ◽  
Vol 9 (2) ◽  
pp. 176-176
Author(s):  
A. A. Mikharev
Keyword(s):  
New System ◽  
Astronomical Constants

scholarly journals Astronomical Units and Constants in a Relativistic Framework

1995 ◽  
Vol 10 ◽  
pp. 201-201
Author(s):  
N. Capitaine ◽  
B. Guinot
Keyword(s):  
General Relativity ◽  
Minimum Degree ◽  
Degree Of Approximation ◽  
Theoretical Background ◽  
Point Of View ◽  
Astronomical Unit ◽  
Dynamical Astronomy ◽  
Unit Of Length ◽  
Relativistic Framework ◽  
Astronomical Constants

In 1991, IAU Resolution A4 introduced General Relativity as the theoretical background for defining celestial space-time reference sytems. It is now essential that units and constants used in dynamical astronomy be defined in the same framework, at least in a manner which is compatible with the minimum degree of approximation of the metrics given in Resolution A4.This resolution states that astronomical constants and quantities should be expressed in SI units, but does not consider the use of astronomical units. We should first evaluate the usefulness of maintaining the system of astronomical units. If this system is kept, it must be defined in the spirit of Resolution A4. According to Huang T.-Y., Han C.-H., Yi Z.-H., Xu B.-X. (What is the astronomical unit of length?, to be published in Asttron. Astrophys.), the astronomical units for time and length are units for proper quantities and are therefore proper quantities. We fully concur with this point of view. Astronomical units are used to establish the system of graduation of coordinates which appear in ephemerides: the graduation units are not, properly speaking astronomical units. Astronomical constants, expressed in SI or astronomical units, are also proper quantities.

scholarly journals Proceedings of the Joint Discussion: Parameters of the Earth's Gravitational Field

1966 ◽  
Vol 12 (2) ◽  
pp. 607-609
Author(s):  
A. H. Cook
Keyword(s):  
Gravitational Field ◽  
Executive Committee ◽  
Working Group ◽  
General Assembly ◽  
International Astronomical Union ◽  
Earth’S Gravitational Field ◽  
International Astronomical ◽  
Astronomical Constants

The Chairman, W. Fricke, President of Commission 4, opened the Joint Discussion by drawing attention to the purpose and proposed procedure for the meeting. The Joint Discussion had been arranged by the Executive Committee of the Union in order to avoid the necessity for separate discussions by each Commission that was affected by the Report of the Working Group on the IAU System of Astronomical Constants. The Organizing Committee therefore proposed the following resolution:‘The members of the IAU at this Joint Discussion recommend to the Executive Committee that the following resolution be put before the General Assembly: “The International Astronomical Union endorses the final list of constants prepared by the Working Group on the System of Astronomical Constants and recommends that it be used in the national and international astronomical ephemerides at the earliest practicable date.’”

scholarly journals Proceedings of the Joint Discussion: Arguments in Favor of the Revision of the Conventional System of Astronomical Constants

1966 ◽  
Vol 12 (2) ◽  
pp. 604-606
Author(s):  
W. Fricke
Keyword(s):  
Executive Committee ◽  
Working Group ◽  
General Assembly ◽  
Conventional System ◽  
International Astronomical Union ◽  
International Astronomical ◽  
Astronomical Constants

The Chairman, W. Fricke, President of Commission 4, opened the Joint Discussion by drawing attention to the purpose and proposed procedure for the meeting. The Joint Discussion had been arranged by the Executive Committee of the Union in order to avoid the necessity for separate discussions by each Commission that was affected by the Report of the Working Group on the IAU System of Astronomical Constants. The Organizing Committee therefore proposed the following resolution:‘The members of the IAU at this Joint Discussion recommend to the Executive Committee that the following resolution be put before the General Assembly: “The International Astronomical Union endorses the final list of constants prepared by the Working Group on the System of Astronomical Constants and recommends that it be used in the national and international astronomical ephemerides at the earliest practicable date.’”

scholarly journals The constant of nutation and the system of astronomical constants

1965 ◽  
Vol 21 ◽  
pp. 109-113
Author(s):  
R. O. Vicente
Keyword(s):  
Theoretical Models ◽  
Fundamental Constants ◽  
The Moon ◽  
The Earth ◽  
Astronomical Constants

The author discusses the dependence of the constants of nutation and precession upon the values of other fundamental constants such as the dynamical ellipticity of the Earth, the mass of the Moon and the solar parallax in the case of two different theoretical models of the Earth.

scholarly journals Pulkovo Observatory's Status in 19th Century Positional Astronomy

1990 ◽  
Vol 141 ◽  
pp. 15-24
Author(s):  
Kevin Krisciunas
Keyword(s):  
19Th Century ◽  
High Weight ◽  
Scientific Organization ◽  
Small Deviations ◽  
Positional Astronomy ◽  
Astronomical Constants

The most significant basis of the reputation of a scientific organization is the accuracy and influence of its work. From a comparison of values of certain astronomical constants and stellar parallaxes obtained at Pulkovo and elsewhere, the extremely high weight given to the Pulkovo values (e.g. by Newcomb) is further justified in retrospect given the small deviations between Pulkovo values and the “modern” values accepted a century later.

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