Can you imagine how bright the stars and other heavenly objects must have been in Magellan’s time, especially out in the open seas?
When you are at sea more than 25 miles from shore they are just as bright today as they ever have been. Light pollution on land reaches all the way down to my back yard and contending with the the neighbors LED security lights.
I did lots of star gazing at sea and could surprise most Quartermasters with what a hole snipe knew about celestial navigation.