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 The Ephemerides: Past, Present and Future

1979 ◽  
Vol 81 ◽  
pp. 99-114 ◽  
Author(s):  
P. K. Seidelmann
Keyword(s):  
Observational Data ◽  
Cooperative Methods ◽  
New System ◽  
Astronomical Constants

Over the years there has been a continuing trend toward unification of both the annually printed volumes of ephemerides and the fundamental bases for the ephemerides. Thus, from many completely independent national and private publications, which were based on a multitude of theories, there has developed a continually improving agreement on accurate astronomical constants, planetary, lunar and satellite theories and cooperative methods of printing the annual ephemerides in different languages. This trend is continuing, currently, with the adoption of a new system of astronomical constants in 1976, consideration of revisions of nutation, the planned revision of the A.E. (American Ephemeris and Astronomical Ephemeris) for 1981, and the expected introduction in 1984 of new fundamental planetary and lunar ephemerides based on the new constants and on the FK5. Currently the differences between the printed ephemerides and observations sytematically exceed 2″ for Mars at some times and 6″. for Neptune at all times. It is anticipated that a new set of fundamental theories will be introduced which will be based on a consistent set of astronomical constants and in agreement with the available observational data to the printed accuracy.

scholarly journals Report to the Executive Committee of the Working Group on the System of Astronomical Constants

1966 ◽  
Vol 12 (2) ◽  
pp. 591-598
Author(s):  
W. Fricke ◽  
D. Brouwer ◽  
J. Kovalevsky ◽  
A. A. Mikhailov ◽  
G. A. Wilkins
Keyword(s):  
Executive Committee ◽  
Fundamental Constant ◽  
Reference List ◽  
Adequate Accuracy ◽  
Conservative View ◽  
Differential Corrections ◽  
True Values ◽  
New System ◽  
Astronomical Constants ◽  
Selection Of

The principal recommendations of this Report on the system of astronomical constants are in accordance with the resolutions passed at Symposium no. 21 (Paris, May 1963). We first of all give a reference list of the constants of the system and a set of explanatory notes. We have used the term ‘primary constant’, rather than ‘fundamental constant’, since the latter has a connotation in astronomical usage that is inappropriate to the manner of selection of the primary constants. In choosing the values for the primary constants we have, perhaps, adopted a conservative view of the likely errors of their determinations, but even so the new system should be of adequate accuracy for astronomical studies for many years. Limits within which the true values are believed to lie are indicated in a later section, in which we also give expressions for differential corrections to the derived constants. Finally we discuss the manner in which this system should be introduced into the national and international ephemerides.

scholarly journals New Celestial Reference System

1980 ◽  
Vol 56 ◽  
pp. 305-316
Author(s):  
P. K. Seidelmann ◽  
G. H. Kaplan ◽  
T. C. Van Flandern
Keyword(s):  
Reference System ◽  
Reference Systems ◽  
Coordinate Systems ◽  
Strong Link ◽  
The Earth ◽  
Celestial Reference System ◽  
Observational Techniques ◽  
New System ◽  
Astronomical Constants ◽  
Planetary Theories

AbstractThe IAU (1976) System of Astronomical Constants, the FK5 and new lunar and planetary theories are being introduced in 1984. The investigation and planning for the transition has revealed the complex interdependencies between observational techniques and the reference systems, and their strong link to the rotating and orbiting Earth. The inaccuracies in our knowledge of the star positions, astronomical constants and the rotation and motion of the Earth are embedded in subtle ways in the observations and the reference coordinate systems. For example, the FK4 reference system in 1950.0 coordinates rotates with respect to an inertial system. Details are given for the conversion to the new system.

scholarly journals Review of the system of astronomical constants

1965 ◽  
Vol 21 ◽  
pp. 251-268 ◽  
Author(s):  
G. A. Wilkins
Keyword(s):  
Current System ◽  
Clear Distinction ◽  
New System ◽  
Astronomical Constants

The purpose and principles of construction of a system of astronomical constants are described. The relationships between the constants are considered; all constants are defined precisely and a clear distinction between fundamental and derived constants is made. The system thus developed differs in some respects from the current system. The practical steps required to implement the formal adoption of such a new system are discussed.

scholarly journals Individual Star Catalogues of the Unified Time Service of Kharkov Scientific and Research Institute and Kharkov University Astronomical Observatory

1990 ◽  
Vol 141 ◽  
pp. 456-456
Author(s):  
S. P. Izmailov ◽  
N. G. Litkevich ◽  
V. D. Simonenko ◽  
V. I. Turenko
Keyword(s):  
Seasonal Variation ◽  
Universal Time ◽  
Astronomical Observatory ◽  
Time Service ◽  
Common Time ◽  
Individual Star ◽  
New System ◽  
Astronomical Constants ◽  
New Time

The Time Service Catalogue (TSC), which is obligatory for use in all USSR Time Services, was created for the epoch 1958 in the 1970s. Research done in the succeeding years detected a seasonal variation of TSC errors. Thus, a new Time Service Catalogue (TSC2) was required, in order to remove the seasonal errors as well as to satisfy the increasing demands for accuracy in the determination of universal time. During 1986-88 the data of Kharkov Common Time Service for 1980-1987 were reanalyzed using the new system of astronomical constants and two new catalogues were produced.

Resolutions adopted at I. A. U. Symposium no. 21 on the system of astronomical constants

1965 ◽  
Vol 21 ◽  
pp. 322-324
Keyword(s):  
Present System ◽  
Fundamental Constants ◽  
New System ◽  
Astronomical Constants

Résolution 1. — In order to remedy the inconsistencies and inadequacies of the present system of astronomical constants, and to take account of the better determination of such constants provided by recent observations, we recommend that the national and international ephemerides should be based on an improved system of astronomical constants; and that this system should be put into use as soon as it is practicable to the Ephemeris Offices. The new system shall be defined by a non-redundant set of fundamental constants, and by explicit relations between these and the constants derived from them.

4. Ephemerides (Ephemerides)

1988 ◽  
Vol 20 (1) ◽  
pp. 1-6
Author(s):  
B. Morando ◽  
P. K. Seldelmann ◽  
V. K. Abalakin ◽  
S. Aokl ◽  
J. Chapront ◽  
...  
Keyword(s):  
General Assembly ◽  
New Delhi ◽  
Minor Planets ◽  
Gradual Introduction ◽  
New System ◽  
Astronomical Constants

This report covers the period from 1 July 1984 to 30 June 1987. The ephemerides that have been published during this period have made use of the new system of astronomical constants adopted at the XVIth General Assembly of the lAU in Grenoble. Yet some difficulties have arisen because of the lack of catalogues or maps of the heavens established for the epoch J2000.0. This is awkward for observers of comets and minor planets and, for that reason, Commission 20 decided, at the New Delhi meeting of lAU that there would be a gradual introduction of the J2000.0 system as far as those bodies are concerned.

Response to Intervention: A New System for Prevention and Identification

2006 ◽  
Vol 7 (3) ◽  
pp. 10-16 ◽  
Author(s):  
Maureen Staskowski
Keyword(s):  
Response To Intervention ◽  
New System

New System Targets Rotors for AF Ablation

2011 ◽  
Vol 9 (7) ◽  
pp. 20-21
Author(s):  
BRUCE JANCIN
Keyword(s):  
Af Ablation ◽  
New System

Astronomical Constants

1977 ◽  
pp. 420-420
Keyword(s):  
Astronomical Constants
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