He indicates that a theory deriving from observations can also transcend them. Kuhn says that since the two sphere universe is based on the human imagination of the observers, it cannot account for all the motions of celestial bodies. Therefore, the cosmology is not complete. Kuhn discusses a specific characteristic of the two sphere universe. When a man is not already acquainted with the heavens, one observation will seem unrelated.
Conceptual economy is a logical function.
The attitude of the scientist, his belief in the truth of the conceptual scheme, does not affect the scheme's logical ability to provide an economical summary. However, conceptual schemes have both psychological and logical functions, and both of these are dependent on the scientist's beliefs. Kuhn describes this is a convenient device for recapitulating what already is known. Kuhn says a two sphere cosmology states that the earth has a circumference. Therefore, this suggests a state of observations which an astronomer can use to discover the earth's circumference.