Haki is the smaller of the two planets in the Pavala-Haki system, the larger being Pavala. It is by far the brightest object in the night sky, making nighttime on the Haki-facing side of Pavala bright enough that one can read.
The dimmest objects visible to the naked eye on the Haki-facing side are around magnitude +2. The influence of Haki on the nighttime sky extends somewhat beyond the terminator, as in the region immediately beyond Haki's visibility, there is a red glow all night long on the horizon facing Haki from atmospheric scattering. This fades away beyond the region where Haki is around ten degrees below the horizon.
Eclipses of Haki by Pavala are very frequent, happening in two seasons per year. These seasons last for about ten to fifteen Pavalan days each (i havent checked precisely how long they are), meaning that for ~15% of days per year, Haki is visibly eclipsed at night. Haki also frequently eclipses Pavala, with total eclipses lasting slightly less time on Pavala than they do on Haki.
Pavala and Haki are at the perfect distance from each other to allow for very rare total eclipses of Haki as viewed from Pavala. During these eclipses, the minimum magnitude of visible object rises +6 to +7 as on Earth during moonless nights. These total eclipses only occur a few times per century and last for only a few minutes each (at the current pavala-haki distance, maybe i will decrease it slightly to make them more common). In pre-scientific times, these moments were seen as very special and feature frequently in mythologies across Pavala.