solar system
The solar system is comprised of two suns, Sol and Luna, and four planets, Mars, Neth, Pluto, and Artica. Neth and Artica are the only planets with moons, and Neth is the only planet with a proper atmosphere.
In the unusual system, Sol and Luna orbit each other, and so the center of the solar system is a fixed point between the two, rather than one sun in particular. Mars orbits Sol, and is little more than a burnt husk, but Neth, Pluto, and Artica orbit the gravitational center of the two suns.
Those on the planet, Neth, believe the energy from Luna to be the source of magic.
The atmosphere on Neth is fairly thick - thankfully! With the magnetic field and thick atmosphere, Neth is spared most of the interactions between the two stars, but not all - every five to ten years, a major flare up will affect the planet. As Neth, the only planet in its system with an atmosphere and water, orbits the two stars, it encounters different seasonal patterns, year patterns, and more.
Neth is larger than Earth. Unlike Earth, which rotated 15° every hour, Neth rotates roughly 14.4° every hour - giving hours 64m instead of 60m. It makes a full rotation in 24 hours of 64 minutes.
Neth revolves around Sol for roughly 420 days, has a ten day in-between period, then revolves around Luna for 270 days, and then had another ten day in-between period before it returns to it's revolution around Sol.
This means that a full year, revolving around both stars, lasts 710 days.
Seasons are much different, as a consequence. During the Sol rotation, Neth is warmer. During the Luna rotation, Neth is colder. However, each planet still has (roughly) a seasonal cycle, due to how it revolves around the planet during it's revolution. It is mostly stable - seasonal beginnings and ends can be a day or two ahead or behind - except after a major flare from the two planets interacting. This happens rarely, because it requires Neth to be between the two planets, during the two ten day periods, to truly be affected.
Around Sol, the northern hemisphere realized a light spring, “true” summer, and a short autumn. As Neth begins it's revolution around Luna, the northern hemisphere then falls into a light winter, hard winter, and a light spring.
The southern hemisphere has more mild seasons, experiencing a true fall, light winter, and true spring around Sol, and then a short blooming spring, an easy summer, and a colorful fall around Luna.
It took many years for the people of Neth to discover how the seasons worked, the resulting optimal plant time, and so on.
The northern hemisphere is considered much more dangerous as a result of the harsher weather - most crops are more painful to grow and animals are heavily adapted to both cycles (or hibernate accordingly).
the day-night cycle around Neth when around Sol only is about 16/8 for the southern hemisphere and 20/4 for the northern hemisphere. The equator experiences (generally) 18/6 (light/dark) around Sol. Luna is generally not visible during the winter/summer months - only in spring/fall is Luna visible.
Around Luna, Sol is almost always visible. There is roughly one month around Luna where Sol eclipses Luna, providing more light and energy than normal - this is the “blood moon” season. The day/night cycle for the southern hemisphere is generally 18/6, 14/10 in the northern hemisphere, and 16/8 by the equator.
Because of the thicker atmosphere, stars from other solar systems are not visible with the naked eye - it is only the three other planets and the two moons that are visible.