Lunar imaging device

[oriel36]

Looking at this understatement -

"The VLBI catalogs do have the disadvantage that their origin of right
ascension is somewhat arbitrary; there is no real equinox in VLBI
catalogs, since VLBI has little sensitivity to the ecliptic plane.
However, this problem has turned out to be more conceptual than
practical, since methods have been developed to relate the VLBI right
ascension origin to the equinox as conventionally defined."

http://aa.usno.navy.mil/faq/docs/ICRS_doc.php#r18

What,for goodness sake,do these astronomers do day in and day out for
I would not consider the proper study of the components of planetary
dynamics as it relates to timekeeping to be in anyway difficult beyond
the extended reasoning which refers days/years to rotations/orbital
circuits.

With each lunar cycle and at the moment it moves to its position
between the Earth and the Sun,it will register the Earth's axial
precession to the central Sun where the polar coordinates act like a
beacon for the orbital quasi-rotation.I would have thought a few weeks
ago that a telescope on Mars would register this orbital feature but
an imaging device on the moon does the same job,albeit in a less
spectacular way.

There is a mandate to consider the daily rotation of the Earth free of
right ascension as the arguments for the Earth's triple motions
discounted the use of stellar circumpolar motion.This is a tragedy for
everyone here and I am not understating it,the greatness of our race
is in its 'can do' spirit and cutting off the flow of information
between planetary dynamics and terrestrial effects by way of the right
ascension error is simply a downcast thing to do.