Rowden, a young muse from a plane of abstract mathematical idealism called the Beyond, undergoes an initiation trial where he must descend into one of the many physical universes and deduce the logic that governs that reality.
Upon landing, Rowden finds he is and island called Hven, where an astronomer named Tycho Brahe has built and observatory to study the stars. There he discovers that some explanations will bring him closer to the truth while others take him further from it. It is up to you, the player, to separate the truth from the misguided.
No handholding. Everything you learn is closely tied to naked-eye observations of the stars. Every epiphany is earned through the effort of deducing from observations and clues, from building your own sine table to collecting your own astronomical data.
Use real instruments that were used during this time such as the quadrant, sextant, armillary sphere, astrolabe, volvelle, sundial, among others.
Find your latitude and direction, tell the time using the stars, predict the direction of sunrise and sunset, build a sundial from scratch, and more.
How was trigonometry developed? How did people find out they were wrong about the cosmos? Experience the historical context that gave rise to an entirely new framework of the universe, as well as the now forgotten disciplines that had to be left behind such as spherical trigonometry.