Added:

Added Pleiades
Added a bunch of moons, dwarf planets to Sol system and new planets to Proxima Centauri system
Added config option to use game ticks instead of day ticks (game ticks are unaffected by time commands /time, meaning if you turn this option on, using /time set 0 will not reset the sky to its initial state; this, however, also means you will not be able to set the time to witness specific timed events, like Supernovae)
Added Tick Multiplier config option to speed up the rate at which the sky is simulated
Added an actual API section with Javadocs (so that I can feel a little bit less ashamed of the state of documentation for the mod)
Added config option to disable gravitational lensing effects
Added Czech translation
Added German translation by tristankechlo (I added some translations that were missing, so if you notice anything wrong, please do tell me)

Changed:

Changed some of the internal folder structure, normally I wouldn't mention this, but since this affects dependencies, it's probably better if I do
Planet is now an extension of the new ViewObject, which is an extension of OrbitingObject
View Centers now only accept ViewObjects as a valid "view_center"
Textured Space Objects should now properly fade with distance
Decreased nebula render distance, hopefully this should help making the region around Earth look less cluttered when viewed from outside of the Milky Way
Changed how blending during day is defined in View Centers, suns can now blend separately from other objects

Fixed Supernovae not rotating properly
Servers will no longer crash when attempting to launch with Stellar View
Fixed problems switching from textured to untextured stars during a single game session