[LEAPSECS] Reliability

[Zefram]

Rob Seaman wrote:

>It's the usual familiar layered architecture and the apparent position  

>of the Sun is from a higher layer then the - so-called - mean  

>position.


Sidereal time isn't entirely linear in time either, as we all know.
So if the mean behaviour is the more fundamental, presumably you regard
UT2R as more fundamental than UT1.


>                                           few are likely to choose  

>the bizarre curlicues made by the Sun and planets on the celestial  

>sphere as their fundamental coordinate system.


The mean may well make a better coordinate system, but without those
bizarre curlicues the mean wouldn't exist.

-zefram