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The true meridian can thus be found within one minuteofarc:
2
Helmholtz has defined the minimum angle measurable with the naked eye as being one minuteofarc.
3
The human eye can't resolve any object that subtends less than three minutesofarc.
4
We've lost about two minutesofarc.
5
This has an aperture of five inches, a power of thirty diameters, and a field of view of seventy-eight minutesofarc.
6
That is to say, reduced to modern terminology, he places the limit of the sun's apparent size between thirty-three minutes and twenty-seven minutesofarc.