minute and second of arc造句

• In astronomical ephemerides, the positions of significant astronomical phenomena were computed in sexagesimal fractions of a degree ( equivalent to minutes and seconds of arc ).
• The older system of fourth, etc . Hence the modern symbols for the minute and second of arc, and the word " second " also refer to this system.
• From this derives the modern day usage of 60 seconds in a minute, 60 minutes in an hour, and 360 ( 60 x 6 ) degrees in a circle, as well as the use of minutes and seconds of arc to denote fractions of a degree.
• The second has been catalogued as an SI unit, its multiples as units of measure that may be used alongside the SI . 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.
• :I rashly calculate the answer to question 1 as ( roughly ) 0.6 metres, based the formula in Minute and second of arc, group size = tan ( ) ?distance, and presuming the fly is 10mm in length per Housefly, ( Actually, google did the heavy lifting .-- ( talk ) 09 : 30, 21 April 2016 ( UTC)