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“in the light of” vs “in light of”

I see that both phrases "in light of" and "in the light of" are used and people considering both to be correct. Look here and here. Also there is a large corpus supporting both phrases usages; you can consult here.

Question #1:

Though both seems to be correct in terms of being used in writings, which one is grammatically correct?

Question #2:

In there any difference in their meaning implications?