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Reference frames for axial rotation constancy
Flamsteed used the star Sirius as a gauge to imply the false
correlation - "... our clocks kept so good a correspondence with the Heavens that I doubt it not but they would prove the revolutions of the Earth to be isochronical..." Flamsteed The contemporary version is slightly different,going to an extragalactic source yet the false correlation remains the same - "A stellar reference frame is time dependent because stars exhibit detectable motions. For precise astrometric applications, a stellar frame must specify, in addition to positions, an epoch and predicted stellar motions. Imprecise knowledge of proper motion and/or parallax limits the precision of stellar frames at epochs other than the mean epoch of the catalogs. Extragalactic radio sources, on the other hand, are assumed to be very distant (typical redshifts of about 1.0) and thus should exhibit little or no detectable motion. A reference frame defined by the positions of extragalactic radio sources may be said to be a quasi-inertial frame (i.e., a frame nonrotating with respect to an inertial frame) with little or no time dependency. " http://www.journals.uchicago.edu/AJ/...371266526Guest The determination of whether axial rotation is constant or not is far removed from the unsatisfactory premises applied by the IERS . Judging from the bungling that went on last year with the IAU decision to define 'planets' there is no responsible authority or open channel to halt the misguided attempt to alter core astronomical principles which keep clocks in sync with the axial cycle as a principle. There is no central and responsible authority to recognise why isolating axial rotation is important in order to discern if variations in orbital speeds are occuring for climatological purposes. Even with the orginal manuscripts and images of the Earth from space,there is no responsible authority that can reverse the procedure that links the axial cycle to a very distant sourse and return to a focus on the central stellar reference through which the orginal determination between the natural cycle (axial and orbital motions combined ) and the human devised 24 hour cycle was devised. What is happening is bad for everyone ,the great modifications of timekeeping always involved astronomical, civil and religious considerations and a intellectual standard which always mark the high achievements of an age.For all the technological achievements of this era ,the intuitive intelligence which distinguishes timekeeping and structural astronomy does not exist isofar as clocks allied with external references could never directly determine whether axial rotation is constant or not. |
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