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Both days are divided into 24 hours ; each hour into 60 minutes ; and each minute into 60 seconds ; the seconds are sub-divided decimally.
An Introduction to the Elements of Practical Astronomy - Page 39
by James R. Christie - 1853 - 118 pages

## The Universal Preceptor: Being a General Grammar of Arts, Sciences, and ...

Sir Richard Phillips - Arts - 1817 - 316 pages
...over ; the weeks into seven days, or rotations of the earth on its own axis ; those rotations into 24 hours ; each hour into 60 minutes ; and each minute into 60 seconds, or periods, in which a pendulum that is 39,2. inches long, will vibrate. The vibration of such a pendulum,...

## An Elementary Course of Mathematics: Designed Principally for Students of ...

Harvey Goodwin - Mathematics - 1846 - 468 pages
...days recognised by astronomers, viz., Sidereal, Solar, and Mean Solar. Each of them is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. The sidereal day is the interval between two successive transits of the true first point of Aries;...

## Hand-books of Natural Philosophy and Astronomy, Volume 3

Dionysius Lardner - Astronomy - 1854
...revolution of the firmament is called a SIDEREAL DAY. This interval is divided, like a common day, into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. Since in 24 sidereal hours the sphere turns through 360°, and since its motion is rigorously uniform,...

## Hand-book of Natural Philosophy and Astronomy: 3d Course. Meteorology ...

Dionysius Lardner - Astronomy - 1853 - 852 pages
...of the firmament is called a SIDEREAL i>.\ t . This interval is divided, like a common day, into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. Since in 24 sidereal hours the sphere turns through 360°, and since its motion is rigorously uniform,...

## Handbook of astronomy

Dionysius Lardner - 1860
...revolution of the firmament is called a SXDEBEAL DAT. This interval is divided, like a common day, into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. Since in 24 sidereal hours the sphere turns through 360°, and since its motion is rigorously uniform,...

## A Written Arithmetic, for Common and High Schools: To which is Adapted a ...

George Augustus Walton - Arithmetic - 1864 - 348 pages
...earth takes to turn so as to bring the sun to the same meridian again. The solar day k divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. The denominations of time are centuries, years, months, weeks, days, hours, minutes and seconds, TABLE....

## A Treatise on Astronomy

Elias Loomis - Astronomy - 1866 - 338 pages
...— The time of one 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...

## Lecture-notes on Physics..., Part 1

Alfred Marshall Mayer - Matter - 1868 - 115 pages
...which is used by astronomers, is 3m. 56'5s. less than the solar day. Both days are divided into 24 hours ; each hour into 60 minutes ; and each minute into 60 seconds ; the seconds are sub-divided decimally. The hours are designated by the sign h ; the minutes by m...