Okay, so I found Ursa Minor--that's this bear constellation--so that means Polaris's gotta be that star right there. [Sans points, though admittedly it is kind of hard to point to one specific star in the sky.] It's the North Star, 'cause it's always north. Uh, if you're in the northern hemisphere, anyway.

[It's not really important to their situation--trapped here in human bodies and shoved into fake lives. It's silly. But even so, there's that little spark to Sans's tone he doesn't get very often anymore.]