Will you explain what "pass over" meams in the writing below? I can surely guess (like go by) but would like to know the meaning for sure, especially what effect this "over" is making.

They hang out for tow hours while the sun slowly passes over.

Thanks in advance,
Passes over (their heads) as it moves across the sky. The suggestion is that they are doing little during those 2 hours.
Thank you. Very clear.