...The nesting activity of birds in Upper India attains its zenithin May, and then declines until it reaches its nadir inNovember... 
Douglas Dewar 「A Bird Calendar for Northern India」
...From the number of these picturesit would seem that they bore some relationship to the six world-quarters—north,west, south, east, zenith, and nadir...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...These are addressedto the zenith, héyap omáuwu—the invisible space of theabove—and to the nadir, Myuingwa—god of the interior of theearth and maker of the germ of life...
Victor Mindeleff and Cosmos Mindeleff 「A Study of Pueblo Architecture: Tusayan and Cibola」
...There will be two of these poles, the one at the hourin question near the zenith, the other in our nadir, and thereforeinvisible to us, though seen by our antipodes...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...This willbe shown by the time of the change of the pendulum from east towest when the sun reaches the zenith, and vice versa whenit crosses the nadir...
Henry Warren 「Recreations in Astronomy」
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