Better Than Bountiful, Exploration and Structures

The big one: the sky is now full of stars. Plus a pile of new structures, music, and fixes.

The Night Sky (the main event)

• Full constellations placed with real astronomy, filtered to what is visible from the world's latitude (Cassiopeia, Cygnus, Leo and friends)
• All five naked-eye planets, moving at their correct brightness
• Polaris, with the whole sky slowly turning around it
• A periodic comet with a dual tail
• Six classes of meteor, plus full meteor showers
• Aurora borealis rippling overhead
• Rare events, including a comet train if you are lucky

New Structures

• Brick Pyramids: the classic Indev pyramid, rare out in the desert
• Cobblestone Indev structure: the old cobblestone build, ultra rare
• Footprints: tracks pressed into the ground with loot buried underneath
• Desert Wells: now hide a loot chest down in the sand at the bottom
• Nether Mining Outpost: a new abandoned outpost that generates in the Nether

New Content

• Double Time music disc
• More background music: Dragon Fish, Shuniji and Axolotl, plus Halloween music down in the Nether
• Two rare, slightly corrupted cave ambience sounds
• Custom capes
• Horizontal iron bars and glass panes
• A fresh batch of splash texts, including ones that only show up on certain dates (Christmas, the OP's birthday)
• Two new achievements: one for witnessing every meteor type, the comet and the aurora, and one for spotting every celestial body

Tweaks

• Snowballs now put out fire, throw one at a burning player or at yourself (great in the Nether)
• Sleep counter in chat, for example "2/4 players sleeping"
• Mod commands split into /btb help for everyone and /btb op for operators

Fixes

• Fixed the misaligned crafting table texture
• Fixed slim (Alex) skins again