A tl;dw of the points discussed with the doctor. He has an app for the eclipse
https://goo.gl/wZ5UyzTemperature gets cooler in the ground first.
Tells you how to make a pinhole projector
Tells you to get safe glasses
Shadows that are parallel to the crescent are sharp. While shadows that are perpendicular are fuzzy
As well as round holes the sunlight going through them will be crescent shaped.
Air from hills will cool down and roll down towards you creating a slightly chilly wind. If there are hils getting blocked sunlight first.
Certain types of clouds will disappear.
Animals will behave differently. Crickets will chirp. Birds will be going back to their nests. Bees will get confused and wait until it's over. Chickens also something like that.
The color of things will change
There will be these weird shadows that look like they are moving on the ground. Especially visible right after the sun comes back out.