I don't really understand your paraphrase. Each of the lines is comparing a vast thing with a small thing. What it means to see a vast thing in a small thing is in your imagination, though I think most people would have broadly similar imaginings.
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red appleI wanted to know if "an hour" is referring specifically to "60 minutes" or generally to "the present time" that according to your comment it seems to refer to "60 minutes"Literally yes, though to reduce it to "60 minutes" seems rather unpoetic!