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Frank:

Interesting.   I went back to heavens-above.com and it displayed time 
dead on as compared to my WWVB clock.   I then brought up time.gov and 
suddenly heavens-above was about five seconds slow!!   I wondered if 
there might have been problems with the Javascript engine, resource 
sharing or whatever that caused it to slow.   I played a bit with 
bringing up time.gov again and again to see if I could make 
heavens-above slow down and suddenly it was back in sync!    Since then 
I've played with both time sources, bringing up new browsers and 
different ones and I haven't been able to shake heavens-above.  

Ah, the joy of computers!

Lu

frankreed@HistoricalAtlas.com wrote:
> Lu, you wrote:
> "but I'm looking at heavens-above.com and its display is about seven seconds 
slower than time.gov.  I suspect that while, as they claim, they have very 
accurate time-keeping on their server, they're not compensating for 
propagation delay across the Internet."
>
> Interesting! Seven seconds is a big error. I just experimented with three 
different browsers (Internet Explorer, Google Chrome, and Firefox, all 
running under Windows Vista). I was able get de-synchronizations of the 
various time displays of up to half a second by minimizing and then restoring 
the browser windows (which is to be expected since the animated time display 
is just a javascript function), but when I refreshed the page, they were all 
back within an indistinguishable fraction of a second compared to WWV. And I 
think we *have* to believe that they are compensating for Internet 
propagation delay when the page first loads. I don't have any special 
pipeline to that web site!
> .
> .
> .
> I just spent five minutes away from my computer and have come back to see 
how they're doing. The javascript displays in the three browsers have 
de-synched by about a quarter of a second.
>
> -FER
>
>
> >
>   

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