Arago point

Arago point

[′a·rə‚gō ‚pȯint]
(optics)
A neutral point located about 20° directly above the antisolar point in relatively clear air and at higher elevations in turbid air.
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References in periodicals archive ?
In France [astronomer Francois] Arago pointed out that the accomplishments in the land of the free were being surpassed by those in the 'land of the serfs.' John Quincy Adams impassionately echoed the phrase in this country, urging the establishment of a national observatory."