Now our Ph.D's must collaborate and study the 5th Canto to make a model for building the Vedic Planetarium. My final decision is that the universe is just like a tree, with root upwards. The universe is also composed of planets which are fixed up in the tree like the leaves, flowers, fruits, etc. of the tree. The pivot is the pole star, and the whole tree is rotating on this pivot. Mount Sumeru is the center, trunk. The planets have their fixed orbits. There are pathways leading from one planet to another made of gold, copper, etc., and these are like the branches.
Letter to Svarupa Damodara dasa, 27 April 1976