How long does sunlight take to reach the earth?

As light from the Sun takes 8.4 minutes to travel 1.93 millions miles
to Earth. But
Now gravitational time dilation is the effect of time passing at
different rates in regions of different gravitational potential which
was tested/ confirmed with difference of nanosecond recorded by atomic
clocks at different altitudes.
Sun gravity decreases as we move away from it and so time dilate.
Similarly earth's gravity has also affect its speed when it enter into
earth’s gravity medium. This means that speed = (distance/time (s=vt))
of light is not constant because of the time differences or time
dilation.
Similarly,
Second is currently defined as
http://en.wikipedia.org/wiki/Second#Inte...
the duration of 9 19 631 770 periods of the radiation corresponding to
the transition between the two hype levels of the ground state of
caesium 133 atom.
This definition refer to the caesium atom at rest at a temp of 0
K(absolute zero). The ground state is defined at zero magnetic field.
The second thus defined is equivalent to the ephemeies second which
was based on astronomical measurements.

From the above discussion, time dilation, the high magnetic filed and
temperature of sun should effect the length (duration) of time as one
move away from sun ?
If yes, then how long does sunlight take to reach the earth?
And how speed of light is affected when it enter from sun’s gravity
medium into earth’s gravity medium?

Further, acceleration is the rate of change of instantaneous speed.
This means that light from sun changes or reduces its speed at every
gravitational potential due to time dilation and should decelerating
till it diminish. While E=mc^2 , C^2 (Speed which I think should not
be constant) was used in the equation instead of deceleration.
Similarly I don’t understand how astronauts on the moon were
communicating to their colleagues on earth due to time dilation.

Note: Time on moon is depend upon its position wrt the sun and earth
in its orbits. As time depend upon gravity therefore time on moon
should be either past or future wrt earth.

This means that we can go in past or future if we travel at speed of
light. Is it possible?

Khattak
.

Relevant Pages

  • OT Buck Rogers aliens [was Errand of Mercy - Thoughts]
    ... Star Trek with abundant lost colonies of humanity being encountered and ... discovered would have the advantage of making the many human-shaped aliens ... tribes" of humanity. ...
    (rec.arts.startrek.tech)
  • Re: Aberation and the Speed of Gravity
    ... Centrifugal force is based on treating a Rotating Frame of Reference as if ... earth moving in a straight line and gravity can ONLY act perpendicular ... GR uses the "apparent" position of the Sun ...
    (sci.physics.relativity)
  • Re: Is gravity relative?
    ... If the sun were to disappear, the earth would continue to orbit ... Let me suppose that the sun suddenly splits into two equal parts flying apart with a speed ~0.9 c, neither of which hits the earth. ... Then yes, knowledge of this splitting would reach the earth simultaneously via light and gravity, ~8 minutes after the split. ... But the "gravitational force" from the sun felt on earth at that time points toward the sun's position in this frame at that time. ...
    (sci.physics.relativity)
  • Re: Aberation and the Speed of Gravity
    ... The earth is attempting to ... straight line and gravity can ONLY act perpendicular to the current ... it can't be in a circular orbit. ... GR uses the "apparent" position of the Sun ...
    (sci.physics.relativity)
  • Re: How long does sunlight take to reach the earth?
    ... Sun gravity decreases as we move away from it and so time dilate. ... the time dilation from the Sun is very small since the Sun ... colleagues on earth due to time dilation. ...
    (sci.physics.relativity)
Quantcast