...instead of keeping apparent solar time keep mean solar time as indicated by the motion of an imaginary body called the mean sun, which is supposed to move uniformly in the equator at the same mean rate as that of the true sun in the ecliptic. Definition. — A mean solar...

...-3 56.9 -9.87+ ON THE ARRANGEMENT AND USE OF THE AMERICAN EPHEMERIS AND NAUTICAL ALMANAC. There are in general use three different kinds of time, True...the circuit in one tropical year. Since mean solar tune is uniform and regular in its passage, clocks and watches may be regulated to it, and those in...

...motion of the Sun, the length of the day being the interval between two successive transits of the iun over the same meridian, and the time of day being...tropical year. Since mean solar time is uniform and •jgular in its passage, clocks and watches may be regulated to it, and those in ordinary use are...

...same meridian. mean solar time — Time measured by the diurnal motion of a fictitious body, termed the mean sun, which is supposed to move uniformly...equator, completing the circuit in one tropical year. Often termed simply mean time. The mean sun may be considered as moving in the celestial equator and...

...same meridian. mean solar time— Time measured by the diurnal motion of a fictitious body, termed the mean sun, which is supposed to move uniformly...equator, completing the circuit in one tropical year. Also called mean time. The mean sun may be considered as moving in the celestial equator and having...

...convenient for most modern purposes because of its variability. Instead, astronomers measure time in terms of a fictitious body called the mean Sun, which is supposed to move along the equator with a uniform motion in right ascension equal to the mean motion of the real Sun...

...Sidereal Time or Star Time, True Solar Time, also called Apparent Solar Time, and Mean Solar Time. Mean Solar Time is measured by the motion of a fictitious...uniform and regular in its passage, clocks and watches are regulated to it. The Equation of Time (Sun fast or Sun slow) is the difference in the hour angle...

...order to establish a solar day of uniform length, a fictitious luminary called the mean, sun is assumed to move uniformly in the celestial equator, completing the circuit in one tropical year. (See par. 19.) As used in the American Ephemeris and Nautical Almanac a mean solar day coincides with...