Three Moons

Description
Before life emerged on Hjarta, she was blessed with three moons that would always shine light upon her. However this caused chaotic tides and storms when the moons aligned every 5 years known as the Megamareal. Every fourth alignment or 20 years, the moons align along periapsis, increasing the level of tidal influence causing major natural disaster known as the Teramareal.

The next Megamareal is due in 1575, the next Taramareal is predicted in 1580