Very well thought out and I would be interested in seeing the rest of this cosmology.  Easy to implement and a great variation on the more popular multiverse concepts in other systems.  

Thank you for the kind words! I'll probably need to make a follow-up because 8 pages just wasn't enough. Things that got cut for space include:

• The planes of Yld, The World Tree, Twilight, and Stormcellar
• A few spells like Gate (for WIS casters), Planar Attunement, and The Call of the Void
• A handful of related magic items like Moonsilver, Anchor Bells, Farscrying Bowl, and the Glockenspiel of All Time
• A few monsters like Sun Hunters, Arcadian beasts, Void Brains, Brightwisps, and the Gatekeepers
• The "what creature is about to come through this sudden planar rift" table

Absolutely fascinating read! I will use it in my game.

Definitely Printer-friendly. Packed full of knowledge. I love the little margin notes. tons of useful lore. 5/5. You did an excellent job!

This is indeed a 5-star product! I love the interpretation of time and the formation of each plane! Wonderful job Keith! Out of the 24 submissions I've looked at so far this is the most probable to find itself in my game.

I greatly appreciate what you have made here. I'd also like to mention that the margin notes are fantastic. Gave the whole read a nice sprinkle of personality.

Ambitious, yet functional and concise. The margin notes are fantastic.

I will absolutely use this. Very nice work.