Putting this here instead of the thread about the eclipse because I have a more general point to make...
Have you ever noticed that when the Moon (or the sun for that matter, although it's harder to see because it's so bright) is low on the horizon, it can look really huge? But that once it's high overhead, it doesn't anymore? Would you believe it if I told you that this effect is entirely in your mind, and not some kind of atmospheric refraction effect? Well, it's true, and you can prove it with photographs.
Next time you see the full Moon fat and huge as it's rising or setting near the horizon, whip out your phone and snap a photo with no zoom-in, just normal default mag. Then when it's more or less vertical, do the same thing (either later that night if you are catching it on the rise or the next evening if you're catching it setting-- so that it's about the same extent of fullness). Load up the photos on your screen and put them side-by-side, and you will see the diameter of the Moon is exactly the same even though you swore it was way bigger when on the horizon.
It's just a mental proximity effect. Your mind sees the object apparently close to the horizon and inflates the perceived size. The atmosphere can make the shape of the Moon (or sun) waver a little when it's very low in the sky, because the light is passing through a greater thickness of air, but it does not magnify its size in any noticeable way. I refused to believe this at first, until I did the test myself.
Here is a composite image taken last week on 2/10 during the partial lunar eclipse that will demonstrate that this is true. This was shot from Cocoa Beach, Florida, not far from NASA Kennedy Space Center. Note how the Moon is very close to the ocean horizon at the bottom but at almost 45 degrees up at the higher position. I'm sure many of us have seen moonrise over the water and noted how giant the Moon looks at such times. The photo is conclusive that it's the same diameter at every stage.