XPost: sci.physics.relativity   
   From: relativity@paulba.no   
      
   Den 15.09.2025 22:26, skrev Maciej Woźniak:   
   > On 9/15/2025 9:25 PM, Paul B. Andersen wrote:   
   >>   
   >> How do we synchronise TAI and UTC clocks?   
   >>   
   >> Let two clocks A and B be stationary at the geoid at equator.   
   >> Clock B is a distance L east of clock A.   
   >> We know that clock A is synchronous with UTC, and we want to   
   >> synchronise clock B to UTC.   
   >>   
   >> How do w do it?   
   >> The problem is that TAI and UTC clocks are synchronous in   
   >> the non rotating Earth centred frame of reference (ECI-frame),   
   >> they are NOT synchronous in the ground frame.   
   >> But the clocks A and B are moving in the ECI-frame,  and   
   >> we can't stop the spinning of the Earth to sync the clocks.   
   >>   
   >> The following calculations are made in the ECI frame.   
   >> v = 465.1 m/s  v/c = 1.55e-6   
   >>   
   >> We assume that at t = 0 the clocks are synonymous and show 0.   
   >> That is at t = 0, tA = 0 and TB = 0.   
   >> If we send a light pulse from clock A to clock B, clock B   
   >> will move away from clock A at the speed v.   
   >> We can calculate the time the light pulse will use to hit B:   
   >>  ct = L + vt  =>  t = L/(c-v) = (L/c)⋅(1 + 1.55e-6)   
   >>   
   >> That means that if clock A showed t1 when the light pulse   
   >> was emitted, then, to be synchronous with clock A, clock B   
   >> must show t1 + (L/c)⋅(1 + 1.55e-6) when the pulse hits it.   
   >>   
   >> TAI clocks are routinely synced after the basic principle shown above.   
   >> (The details are different of course. Satellites, optic fibre, radio)   
   >   
   > What a pity that the nonsense of your idiot guru   
   > is practically unusable...   
   >   
      
   Interesting, but not surprising, to see that you believe   
   that Einstein invented the International Atomic Time   
   which consists of hundreds of clocks kept in sync with each other.   
      
   BTW, have you got a wristwatch?   
   That clock is in sync with UTC, showing UTC + 2h.   
   Is your wristwatch practically unusable?   
      
   But thanks for yet another demonstration of your ignorance.   
   Well done!   
      
   --   
   Paul   
      
   https://paulba.no/   
      
   --- SoupGate-Win32 v1.05   
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