The meaning of "perspective" here
My interpretation is that the sky is so grandiose that comparisons to most things is close to impossible, probably suggesting that focusing on the sky too much makes everyday objects appear disproportionately insignificant. A very crude example might be that somebody becomes very dismissive simply because ”space is big”.
I can’t really disprove a reference to physical sciences here but it looks obviously proverbial. While not same exact word, Merriam-Webster supports this interpretation in their entry for stargazing .