DrW wrote:...there has always been enough liquid water in the atmosphere to form rainbows somewhere on the Earth.
you claim it, so prove it.
and while you are at it prove that "liquid water" in the atmosphere has always created rainbows...please, provide empirical and reproducible evidence that a rainbow occurred 75,000 years ago.
How do we know? Credible, reproducible, verifiable physical evidence from geology and paleoclimatology tell us so.
Please, provide physical evidence that a rainbow existed 75,000 years ago.
And disregard providing evidence that water vapor and sunlight existed, correlation does not mean causation. I mean i can likely prove that flour, water, eggs, and sugar all existed thousands of years ago, but that does not mean i can prove that there was a cream-puff.
If you need a tutorial on the physics of rainbows, just ask.
i am not arguing the physics of rainbows, again we all agree on how they work, not on how long they have worked. This is that fundamental nuance i spoke of earlier, where i understand how science "does" describe nature, and others claim that science "has to" describe nature.
Let us note one thing...rainbows are not always present...in other words, there have been many rainstorms where a rainbow was not observed, so arguably it did not occur. That assumption is the converse to the assumption you are making, you are assuming that they always have and will occur when the elements provide a "probable predictability"....a predictability that you would extrapolate not just across the paradigm of actual observation but across time and all eternity.