Why did Percival Lowell choose Flagstaff, Arizona, for establishing his observatory?

Answer

To gain the clearest possible views due to its high-altitude and dry location

Lowell established the Lowell Observatory in Flagstaff specifically because he sought a high-altitude, dry location to achieve the clearest possible views when observing Mars.

Why did Percival Lowell choose Flagstaff, Arizona, for establishing his observatory?
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