The non-rotating origin: conceptual defitinition. Application to the rotation of the Earth

Title:

The non-rotating origin: conceptual defitinition. Application to the rotation of the Earth

Creator:

Souchay, J.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:fd63b76f-8e5a-477b-bb39-a084058bccfa
uuid:fd63b76f-8e5a-477b-bb39-a084058bccfa

Subject:

observations, definition of U.T.1, and rotation of the Earth

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The present definition of U.T.1 is a complex one which introduces the old concept of the ”Fictitious Mean Sun” which has been suggested by Newcomb (1895). The conventional right ascension of the Fictitious Mean Sun brings the basic relationship between Sidereal Time, arising directly from observations, and U.T.1, as it is internationally adopted. Unfortunately, this basic relationship needs some effort of understanding for the common user. It is the reason why B. Guinot (1979) proposed to adopt another point instead of the vernal equinox on the celestial equator, that he called the ‘non-rotating origin σ’. This point obeys to a clear kinematical concept. Moreover, it should bring a new conceptual definition of U.T.1 very easy to understand. The position of σ on the celestial sphere can be easily determined by the Eulerian angles ψ and θ which are positionning the instantaneous axis of rotation of the Earth relatively to an inertial plane of reference. It can also be realized by the way of a quantity 's’ depending on the only motion of the instantaneous equator. Formulation and developpement of ‘s’ are successively given.

Language:

Czech

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Coverage:

191-196

Source:

Publications of the Astronomical Institute of the Academy of Sciences of the Czech Republic | 1987 Volume:63-70 | Number:68

Harvested from:

CDK

Metadata only:

false