Le 16/05/2011 00:29, iov...@inwind.it a écrit :
You are right, the right value for the crystal would be about 32859.27, but I
thought that such a difference could be compensated in the circuitry, that's
why I omitted the decimals.
before you get into grinding I have a question on your chosen frequency.
It doesn't square for me.
1,002737909350795 solar/sidereal time ratio
x 32768 crystal frequency
32857,72 required frequency for sidereal clock with 2^15 divider chain
Regarding the 2^15 division, forget for a moment the second as we know it, and
consider a shorter (sidereal) second. Our crystal which makes 32859.27
oscillations in our ordinary second, will make 32768 oscillations in the
shorter second. The ratio is saved and we will have the shorter second I'm
looking for. Hope I've been clear.
Antonio I8IOV
----Messaggio originale----
Da: michael.c...@sfr.fr
Data: 16/05/2011 0.14
A: "iov...@inwind.it"<iov...@inwind.it>
Ogg: Re: [time-nuts] Sidereal timekeeping
Le 15/05/2011 23:39, iov...@inwind.it a écrit :
I don't think this will work as the divider chain will give wrong length
seconds.
Michael,
I'm just looking for shorter seconds, in order to keep sidereal time with
ordinary clocks.
Antonio,
Yes I figured that, but I thought the frequency wrong for the 2^15
division. The ration for siderial/solar time according to
wiki is 1⁄1.002737909350795, using your value I got 1/1,002777099609375
, which makes your day 86160,723089564, rather than 86,164.090530833.
Quite a bit short. My maths may be wrong though.
Antonio I8IOV
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