Is what you see the way it is?


The plan for Fridays class did not match the reality.
If things don't go right, should you quit?

Day and night

The earth's orbit:


Structure of the reasoning so far:

We have made a model.

We deduce consequences that can be tested by observation.

The moon's orbit:

The planets' orbits:

Davison E. Soper, Institute of Theoretical Science, University of Oregon, Eugene OR 97403 USA