[time-nuts] Time of death-Again
jimlux at earthlink.net
Sat Oct 30 14:48:30 UTC 2010
On Oct 30, 2010, at 3:31 AM, Javier Herrero <jherrero at hvsistemas.es> wrote:
> El 30/10/2010 10:31, Hal Murray escribió:
>> Suppose you have to go back a zillion years. Now the fuzz on the period adds
>> to the fuzz on measuring an individual pulse.
> Not to forget that pulsar frequencies spins down as the energy that they emits is ultimately drawn from its rotational energy (PSR B1937+21 spins down at 1.05 x 10^-19 seconds per second). In a zillion years this could amount a bit of time (several hundred microseconds over the 2.29 x 10e8 years life of this pulsar if the spin down rate would have been constant - too much drift for a real time-nut ;) )
But if the decay rate is known, you could factor that into your calculation. In fact wouldn't specifying the time of an event as the observed phase of the pulsars be unique. That is if something is at a time of 75%A,22%B,54%C, does that specify a unique time and place?
Percent, here, is where the event occurred in the period between the pulses
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