...complete revolution of the firmament is called a sidereal day. This interval is divided into 24 sidereal hours, each hour into 60 minutes, and each minute into 60 seconds. Since the celestial sphere turns through 360° in 24 sidereal hours, it turns through 15 degrees in one sidereal...

...complete revolution of the firmament is called a sidereal day. This interval is divided into 24 sidereal hours, each hour into 60 minutes, and each minute into 60 seconds. Since the celestial sphere turns through 360° in 24 sidereal hours, it turns through 15° in one sidereal...

...average interval between two successive passages of the sun across the meridian. The mean solar day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds, so that one second is ^-onr part of a day. For a great number of purposes the mean solar day is an...

...to decimals of a day, and see if when added to the decimals of the preceding exercises the sum is 1A 000 000 0, as it should be. TABLE IX. TO CONVERT TIME...60 seconds. Since 360' = one circumference, we have lh = 15°; lm = 15'; Г - 15"; che signs h, m, .and " indicating hours, minutes, and seconds of time....

...earth on its axis before the sun. The average time of this rotation is called the mean solar day it is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds ; and these divisions of time are measured by clocks and watches. The unit of time usually employed...

...regarded as at an infinite distance and immovable. A sidereal clock expresses this day, and divides it into 24 hours, each hour into 60 minutes, and each minute into 60 seconds of sidereal time. If the transits of the centre of the sun be observed, then the interval of tune between...

...regarded as at an infinite distance and immovable. A sidereal clock expresses this day, and divides it into 24 hours, each hour into 60 minutes, and each minute into 60 seconds of sidereal time. If the transits of the centre of the sun be observed, then the interval of time between...

...motions desired is likewise obtained by mechanical connection with this shaft. Clock. — The day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. One hand indicates the hours; one the minutes, and one the seconds. The three hands have rotary motions,...

...of the earth on its axis fixes the day; its revolution around the sun fixes the year. 2. The day is divided into 24 hours ; each hour, into 60 minutes, and each minute, into 60 seconds. TABLE. 60 seconds (sec.) . . . . = 1 minute .... min. 60 minutes =1 hour h. 24 hours =1 day da. 365...

...on the next for the whole year is taken, and this interval is called a mean solar day. Each day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. In order to prevent confusion between minutes and seconds of time, and minutes and seconds of angle...