Continuing one of the greatest mods to ever exist in this game
Astronomer's Visual Pack is a comprehensive visual overhaul for Kerbal Space Program originally developed by Astronomer.
I have been a huge fan of Astronomer's work since my first steps into Kerbal Space Program, during 2014. 2015 would see the hiatus of EnvironmentalVisualEnhancements development, along with the unfortunate demise of Astronomer's Visual Pack, as the version of EVE it ran on, a version made for alpha KSP,
AVP itself probably does not require change for 1.9 compatibility. Its main dependencies, EVE and scatterer, are not compatible with 1.9 yet. As soon as updates is released for those, AVP should play fine on 1.9.
AVP does not include a lens flare at the moment, but you can delete the one included with scatterer by deleting the /scatterer/config/Sunflares folder.