The writer received a letter from Mr. B. V. Myrick, USAACR, Flight Instructor at Vernon, Texas, asking for information concerning the value of the Horizon Angle as seen from different altitudes above the surface of the earth.
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Boon, John D. Sr.
"Horizon Angle and Its Relation To the Altitude of the Observer,"
Field and Laboratory: Vol. 12
Available at: https://scholar.smu.edu/fieldandlab/vol12/iss1/6