Newton originally said there were five colours in the rainbow, but later revised this upwards to seven. I don’t know about you, but I find it very difficult to see the differences between blue, indigo and violet.
So why the revision upwards?
Newton had a finger in many pies; he was into alchemy, which was then a mainstream science, and religion. He tried to reconstruct Solomon’s Temple from the details in the Bible.
Now, I don’t quite follow why 10 is a perfect number, but to people like Newton it was. As part of this ‘perfection’, there were the trinity of Father, Son and Holy Ghost. If their number is removed from 10, we get seven. So all God’s creations, if they are to be perfect, much contain seven parts.
So, the rainbow has to have seven colours.
And no, I don’t really follow the theology either.
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