# The Sun

1. Nov 19, 2003

### H_Dog

As light travels at X km/h (pretty fast), and Earth is 155,000,000km away from the Sun, How much would the Earth have rotated from the start of the light ray from the sun to the second it hits Earth?
Another way of explaining: Looking from Earth, how many degrees would the Sun have moved in the time the light ray left the Sun and reached Earth?
Or does it point to where the sun is actually located, not it's delayed position?
I had an answer saying "The best and probably the accurate description, is that when the gravitomagnetic components due to the spin of the sun and earth are included into the calculations, they shown that the earth is attracted towards the actual position, not the delayed one."
Is this correct?

2. Nov 19, 2003

### Ambitwistor

It takes about 8.5 minutes for the light to reach the Earth, so it will have rotated about 8.5/(24*60) of 360 degrees.

You're thinking of the direction of the electromagnetic attraction due to a charged body (or the gravitational attraction of the Sun). See:

http://arXiv.org/abs/gr-qc/9909087

3. Nov 19, 2003

### Guybrush Threepwood

from the article: