That's better, but empirical evidence is visual evidence. Saying empirical/visual evidence is better than "my eyes tell me that the horizon is eye level", (which is empirical evidence) is a nonsensical statement.
--Dave
You're right Dave.
However I have a bone to pick with you.
It pertains to being able to witness the suns arc.
Let me explain.
When I first started roofing I used a gauge on my roofing hatchet.
After a few years and more than laying a few thousand shingles, I no longer needed a gauge.
Since then I've never been beat laying shingles per hour by any other human.
Straight as the sun's rays.
What I'm saying is, in order to watch the sun's arc all you have to do is stand in the same place at different times of the day to observe it's path.
Course you might want to have some of my experience with straight lines before you try it.
[MENTION=17195]daqq[/MENTION] really should get off Google and experience life for real.
Maybe you too.
Just the observations of an ole roofer.
Take how you will.