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The Earth's rotational rate around its own axis is 15 minutes of arc per minute of time (360 degrees / 24 hours in day); the Earth's rotational rate around the Sun (not entirely constant) is roughly 24 minutes of time per minute of arc (from 24 hours in day), which tracks the annual progression of the Zodiac.
The time is usually based on a 12-hour clock. A method to solve such problems is to consider the rate of change of the angle in degrees per minute. The hour hand of a normal 12-hour analogue clock turns 360° in 12 hours (720 minutes) or 0.5° per minute. The minute hand rotates through 360° in 60 minutes or 6° per minute. [1]
Ptolemy discusses the correction needed to convert the meridian crossing of the Sun to mean solar time and takes into consideration the nonuniform motion of the Sun along the ecliptic and the meridian correction for the Sun's ecliptic longitude. He states the maximum correction is 8 + 1 ⁄ 3 time-degrees or 5 ⁄ 9 of an hour (Book III ...
The triple prime ‴, as used in watchmaking, represents a ligne (1 ⁄ 12 of a "French" inch, or pouce, about 2.26 millimetres or 0.089 inches). [3] Primes are also used for angles. The prime symbol ′ is used for arcminutes (1 ⁄ 60 of a degree), and the double prime ″ for arcseconds (1 ⁄ 60 of an arcminute). [4]
The local hour angle (LHA) of an object in the observer's sky is = or = + where LHA object is the local hour angle of the object, LST is the local sidereal time, is the object's right ascension, GST is Greenwich sidereal time and is the observer's longitude (positive east from the prime meridian). [3] These angles can be measured in time (24 ...
The average time of a nine-inning game is 2 hours, 36 minutes through the first full month of the major league season, down 1 minute from 2023 in the second year of the pitch clock. Over ...
A comparison of angles expressed in degrees and radians. The number 2 π (approximately 6.28) is the ratio of a circle's circumference to its radius , and the number of radians in one turn. The meaning of the symbol π {\displaystyle \pi } was not originally fixed to the ratio of the circumference and the diameter.
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