Final answer:
A lower sun's altitude of 10 degrees during an eclipse would lead to a diminished, less sharp, and potentially obstructed view due to atmospheric interference and any horizon obstructions.
Step-by-step explanation:
If the sun's altitude had been 10 degrees during the eclipse in Casper, Wyoming, instead of 55 degrees, the observer's experience would have been significantly different. At a lower altitude, the eclipse's visibility would be affected by greater atmospheric interference. As light travels through more of the Earth's atmosphere, it scatters more, which can diminish the clarity and contrast of the eclipse. The color and brightness of the eclipsed sun might also appear different. Low altitude could lead to a less sharp and less distinct view of the eclipse, possibly making it harder to observe the corona and any stars near the Sun that may be visible during totality. Moreover, if any landscape features such as hills or buildings obstructed the horizon, the eclipse might not be visible at all.