| What a strange question. Are you asking what would be the effect if light were to decellerate from 3x10^8 to 3x10^8/13x10^9 over a year, and how we would account for that to determine the distance of objects?
By the time the Earth is created, light would be moving at practically 0, and we would never have come into existance as heat would never be transferred from the sun to Earth. Getting past that, we would only be able to see objects as they were a few years after the big bang, and a lightyear or 2 away. | 
Linear Mode
