[time-nuts] Time of death-Again

[Neville Michie]

If you use n pulsars of different frequencies where n is a large  
number, then individual pulsars
could do dramatic things and the rest would still define your time.
Include their spin down rate, velocity and position and I think that you
could define a time scale that would enable elapsed time to be deduced
from any arbitrary zero from the phases of all the pulsars.
It is a little like a random version of the method they use for distance
measurement with lasers where they modulate the beam with
IKHz, 10KHz, 100KHz, 1MHz, 10MHz etc and by observing the
phase of each they work out the time delay of flight.
cheers, Neville Michie



On 30/10/2010, at 9:31 PM, Javier Herrero 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 ;) )
>
> Regards,
>
> Javier
>
> -- 
>