Hello amithe1,
It's commendable that you say everything should be based of facts and evidence. Unfortunately, the piece you posted in the opening post of this thread is not an example of that. In his/her desperation to show the hand of god in nature, the author of that piece has had to stoop to the usual level of distortion common among certain groups of christians. It's a classic piece of christians being liars for jesus. One piece of distortion is the length of a day which is taken as 365.250. That might fool many people, but it's not 100% correct. The length of a day is not exactly 365 and a quarter. At present it is 365.242199, see e. g.
What Is The Exact Length Of A Calendar Year? - Science Fact Finder
A tiny deviation, yet it kills the accuracy claimed in the piece you quote. In that, the speed from the calculation matched the speed of light 99.999999999625% accurate, so the first 11 digits in agreement, disagreement only on the 12th digit. But the time taken for the length of a year is already inaccurate on the 6th digit. So the accuracy claimed is exaggerated by a factor of a ~million.
It is also interesting to note that the rate of rotation of the earth is not perfectly constant. During the ice ages for instance, much water was closer to the poles in the form of ice, thereby lowering the angular inertia, speeding up the rate of rotation. Even the Chinese Three Gorges dam was supposed to noticeably affect the rate of rotation, imagine what the volume of water turned into ice during the ice ages would have done. The calculation posted above might actually have been accurate at some stage. But then so would tons of other, slightly different values.
So whoever wrote that is either not well up to speed on things or deliberately dishonest. My guess is the latter, yet another christian showing him/herself a liar for jesus. Which leaves me with low expectations when I ask you how old you think the earth is. Would it be approximately 6000 years?
greets,
Peter