Sun

The Sun is a major celestial body of Poortwart. Similar to Earth's sun, it is the sole source of light and energy to the life forms of Poorthwart.

Days and Nights in Poorthwart
The Sun travels in a North-to-South progression throughout Poorthwart, moving back and forth, left to right to left again, ultimately hitting The Great Bounce and being flung back up again to start its progress anew. It is always in the exactly opposite part of the cycle as the Moon.

Because of Poorthwart's geography, nights in Poorthwart are far longer than days, as for any one place, the Sun is elsewhere for most of the time.