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If the details subtended one minute of arc, the visual acuity would be unity.
(The geographical mile is defined as one minute of arc along the Earth's equator; compare the nautical mile, defined as one minute of arc along any great circle route).
Such early tables were either to one-hundredth of a degree or to one minute of arc.
Their apparent diameters range from one degree for Omega Centauri down to knots of one minute of arc.
The smallest "microsaccades" move the eye through only a few minutes of arc (one minute of arc equals one-sixtieth of one degree).
(One nautical mile, the distance on the Earth's surface traversed by one minute of arc longitude or latitude, is equivalent to 1.15 statute miles or 1.85 kilometres).
Similar(35)
This list includes the hour and minute, the angular measures (degree, minute and second of arc) and the historic [non-coherent] metric units, the litre, tonne and hectare (originally agreed by the CGPM in 1879) Non-SI units whose values in SI units must be obtained experimentally (Table 7).
The measurement of angles has likewise had a long history of consistent use – the radian, being of a revolution, has mathematical niceties, but it is cumbersome for navigation, hence the retention of the degree, minute and second of arc.
0.000873 = tangent of 3 minutes of arc.
0.002618 = tangent of 9 minutes of arc.
There are 60 minutes of arc in 1 degree.
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