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Word: substellar (lookup in dictionary) (lookup stats)
Dates: during 1940-1949
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Usage:

...system uses a blank globe and four drawing instruments to locate positions graphically. The navigator must "shoot the angle" of two stars with a sextant. He marks on his globe the exact substellar spots of these two stars (i.e., the spots where these stars are directly overhead-obtained from star tables). Then he uses these two spots as centers of circles, drawn with the angle measured by sextant. The two circles intersect at two widely distant points; one is the location of the plane. At high speeds and at mind-fogging altitudes the quickness of the method may be literally...

Author: /time Magazine | Title: Science: Plain Tale from Brazil | 1/4/1943 | See Source »

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