2. I'd say "first light" is definitely not countable. That is, we don't have a "second light." I take "first light" as a fixed expression, or compound noun, or something like that.
I don't think "first" is used as a number here, but as a synonym for "beginning." (the beginning light of dawn) It's an interesting question, and probably may be argued.
Thank you. How would you deal with this comma dilemma situation or what looks to be awkward sentence patterns?
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