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The deviation from parallelism between two surfaces, for instance in optical engineering, is usually measured in arcminutes or arcseconds. In addition, arcseconds are sometimes used in rocking curve (ω-scan) x ray diffraction measurements of high-quality epitaxial thin films.
The prime symbol ′ is used for arcminutes (1 ⁄ 60 of a degree), and the double prime ″ for arcseconds (1 ⁄ 60 of an arcminute). [4] As an angular measurement, 3° 5 ′ 30″ means 3 degrees, 5 arcminutes and 30 arcseconds.
There are 60 arcminutes in one degree and 60 arcseconds in an arcminute. If you go back to the Big Dipper, the second star in the handle is a double star system. Some people, with good eyesight ...
Since these angular diameters are typically small, it is common to present them in arcseconds (″). An arcsecond is 1/3600th of one degree (1°) and a radian is 180/ π degrees. So one radian equals 3,600 × 180/ π {\displaystyle \pi } arcseconds, which is about 206,265 arcseconds (1 rad ≈ 206,264.806247").
This article is about divisions of a degree of angle. For divisions of an hour of angle, see hour angle.
Arcminutes and arcseconds are indeed used when measuring the declination of an object on the sky. When measuring the right ascension (RA), these units are not used (as is correctly stated by User:Zandperl in the article). Instead, RA is measured in: hours, (24 h = 360 degrees -> 1 h = 15 degrees)
In Madhava's table, the entry corresponding to 22.50° is the measure in arcminutes, arcseconds and sixtieths of an arcsecond of the angle whose radian measure is the value of sin 22.50°, which is 0.3826834; multiply 0.3826834 radians by 180/ π to convert to 21.92614 degrees, which is
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