Yes, I acknowledge the difference between lamp and light. But then you have to acknowledge that the sun being a source of light as opposed to the moon being a reflection of light, is an occurrence observable to the naked eye.

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Knowledge of the world did not magically begin at the appearance of the Quran. There have been people dedicated to studying the world and it's occurrences long before Islam. Sometimes people tend to forget that although people in the past did not have as advanced technology, they were no less intelligent, and no less capable of observation and study than we are.