Baha'u'llah had the advantage of many centuries of scientific progress between the authorship of Genesis and when he was writing. Personally, I don't consider it particularily astonishing when someone "prophecies" something that was simply the common view in his own time:Bahá’u’lláh confirms the scientists who claim, not six thousand, but millions and billions of years for the history of the earth’s creation. The evolution theory does not deny creative power.
By the early 1800's it was generally accepted that the Earth had a long history. Its age, however, was scarcely settled. The uniformatarians (Hutton 1788, Lyell 1830) pictured the Earth as being indefinitely old.
The catastrophists (Cuvier 1812, de Beaumont 1852, Buckland 1836) accepted that the Earth was old; they disagreed with the kind of change and the rate of change that had occurred over that long history.
There was no single estimate of the Earth's age in the mid 1800's and no good way to arrive at one. There were various attempts to estimate the Earth's age, working back from sedimentation rates and other geophysical phenomena. The attempts produced estimates from about 100 million years up to several billion years.
Changing Views of the History of the Earth
Edit - it's hardly astonishing that Baha'u'llah would estimate a range of "millions to billions" of years for the history of the Earth (although I'm somewhat hesitant to call a range that covers four orders of magnitude an "estimate") - in his time, there was one side arguing that it should be millions and another side arguing that it was billions. It seems to me that he couched his position to allow for either side to be right.
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