No, in the past I believe it was not a physical only universe as it now is. Light in the universe, which was spiritual and physical traveled from the far stars in days! It was a different light. Ours we were left with as the seperation came about. Some day, it will again be merged, in the coming new heavens! Meanwhile the physical only universe light we have is a good indicator for distance, but not at all applicible to time!
I totally agree with you. Light is only a good indicator for distance and not time.
Why is that? We know how fast light travels. It is a constant.How far away will your car be in one hour if it traveled 60 mph?The performance of the car will tell me both distance and speed. It doesn't matter.
What if there exist something faster than light that it can cover 15 billion light year distance in mere minutes?
Then we could use that too. As long as what we are using is a reliable tool or method it doesn't matter what we use.
That will be a problem in calculating the actual age of our universe. Either the universe is only minutes old, if there exist something faster than light or it could be 15billion years old at normal light speed.
The only way anything changes is the rules of the game. Lets make a year equal to a thousand years. Presto it's done. Our years for conversation sake is what we all have agreed to agree on. It doesn't actually change time in any way.
Here's another problem, we measure 1 Earth year as 1 revolution around the Sun which is around 365days at 24hr/day. You have to ponder on this, did these actually stayed constant uniformly for eons?
You have no evidence to suggest otherwise so you have to accept what you know. You want to throw out what you know for something you don't.
What if there was a time in the past where 1 Earth year equals only 100 days or even less? How old will the Earth be? What if the Earth was slowing down making 1 Earth year equal 700days? How old will the Earth be?
So what? The planets in our solar system are prone to the same quirks. It doesn't change time itself only how many times something rotates or makes a complete rotation. There is nothing mysterious about calculating years. It is not different than your clock. These are all things that man has agreed upon to calculate the passing of time.
They say Earth is around 6 billion years old seem doubtful as this measurement is based on 1 year = 365 days = 24 hr day constant.
Its not based on that. The age of the earth is based on the geological strata and wear rates and there is a new testing method that I posted here not long ago. The universe itself is older than that. There is light that is just reaching us now that has traveleled thousands of light years to get here. The 6000 year old earth is a fairy tale.