 | A. F. Walden - 1901 - 300 pages
...successive appearances of the sun, or of some particular star in a definite position in the sky. The day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. The second is thus the eighty-sixthousand-four'-hundredth part of a day. Since then the size of a second... | |
 | Weights and measures - 1956 - 40 pages
...hours being numbered from 1 to 24. The sidereal year is 365.256 36 solar days. The mean solar day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. Thus the mean solar second is 1/864 00 of a mean solar day, and this mean solar second is the unit... | |
 | Sir Charles Frederick Close, Sir Charles Frederick Arden-Close - Surveying - 1905 - 378 pages
...(upper) transits of the first point of Aries, ie, the true vernal equinox, over the same meridian. It is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. When т is on the meridian the sidereal time is 0/(. Om. Os. and it is sidereal noon at that place,... | |
 | International Correspondence Schools - Building - 1906 - 634 pages
...the sun is called a . true solar day, or an apparent day. Like the sidereal day, the apparent day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. Time expressed in these units is called apparent time. On account of the fact that the sun does not,... | |
 | William Carpenter Pendleton Muir - Nautical astronomy - 1906 - 754 pages
...dav. 171. The three days are the sidereal, apparent solar, and mean solar days, each of which days is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds; the subdivisions of the sidereal day being sidereal time, of the apparent solar day apparent time,... | |
 | William Carpenter Pendleton Muir - Nautical astronomy - 1906 - 756 pages
...dav. 171. The three days are the sidereal, apparent solar, and mean solar days, each of which days is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds; the subdivisions of the sidereal day being sidereal time, of the apparent solar day apparent time,... | |
 | Edwin Edser - Physics - 1913 - 656 pages
...; the mean solar day is the mean value of the solar day throughout the year. The mean solar day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. The second is the unit of time used in all scientific researches. We have now defined the three fundamental... | |
 | William Miller Barr - Engineering - 1918 - 650 pages
...to 16% minutes slow. A mean solar day is the average or mean of all the solar days in a year; it is divided into 24 hours, each hour into 60 minutes and each minute into 60 seconds; therefore, one second represents 24 X 60 X 60 = 86400 part of a solar day; the usual subdivision of... | |
 | Sir William Cecil Dampier Dampier - Chemistry - 1924 - 304 pages
...length of the solar day throughout the year — is chosen as the standard unit. The mean solar day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. Thus one second is the one 86,400th part of the mean solar day, and one second is taken as the practical... | |
 | Charles John Pieper, Wilbur Lee Beauchamp - Science - 1925 - 648 pages
...latitude where you live? What are the latitude and longitude of the North Pole? 30 day. This we divide into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. Time varies with the longitude. The mean solar time varies at places having different longitudes. If... | |
| |
Conventionally the period is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. 
