It's not porces, but potes 
And "galli" stands for the rooster, I presume.
Recta linea si serves luminu[m] intuitu horas noctis nosse potes galli sine vocib??
So it seems to be about knowing the night hours without the help of a rooster.
The whole passage is called "spera celi" - the celestial sphere. But what those quasi-pipes (divisions) stand for? And what does the star in the centre stand for?
And "galli" stands for the rooster, I presume.
Recta linea si serves luminu[m] intuitu horas noctis nosse potes galli sine vocib??
So it seems to be about knowing the night hours without the help of a rooster.
The whole passage is called "spera celi" - the celestial sphere. But what those quasi-pipes (divisions) stand for? And what does the star in the centre stand for?