Talk:Terrestrial Time

Time Unassessed

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Need to update TT - UTC

Even though the date of the last leap second was updated, the value of TT-UTC was not; should be updated to 66.184 s. User:Arnold Rots

TT is a coordinate time, not a proper time

IAU Resolution B1.9 (2000) as seen at http://syrte.obspm.fr/IAU_resolutions/Resol-UAI.htm reiterates the content of IAU Resolution A4 (1991) wherein TT is defined as a coordinate time, not a proper time. This distinction was further explicated by Gerard Petit at IAU Joint Discussion 16 (2006, Prague) as cataloged at http://adsabs.harvard.edu/abs/2006IAUJD..16E..21P (the actual presentation is at http://syrte.obspm.fr/iauJD16/petit.pdf ). To wit, TT is defined as a linear transformation of TCG. TCG is a coordinate time, therefore TT is a coordinate time. At the sub-nanosecond level this distinction is important. Steven L Allen 19:18, 1 July 2007 (UTC)[reply]

level of clarity

i find this article incredibly difficult to understand. should it be rewritten in a less technical fashion?

It's a very technical subject. The detail and precise terminology does have to be there. I oppose a wholesale rewrite, but if a less technical explanation (which would inevitably be less complete) can be added then that would be a good thing. I'm not sure how to go about that though: I find the article very clear. What do you suggest? Perhaps if you ask about particular points of confusion here then this would point to ways to explain it better. 81.168.80.170 20:23, 14 February 2007 (UTC)[reply]

Yes, but I'm inclined to agree that there is room for improvement. The initial paragraph really only says that Terrestial Time takes relativistic effects into account. Most people will have some concept of what SR and GR are all about, even if terms like proper time, and perhaps even time dilation will be unfamiliar. Another issue is that many readers will be familiar with special relativity, as it really does not require advanced mathematics, but general relativity will be more mysterious. Or will it? Greg Woodhouse 21:07, 19 March 2007 (UTC)[reply]