 | Sir William Cecil Dampier Dampier - 1924 - 304 páginas
...day — the average length of the solar day throughout the year — is chosen as the standard unit. The mean solar day is divided into 24 hours, each...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 - 1925 - 648 páginas
...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... | |
 | K. K. Mohindroo - 1997 - 1000 páginas
...together and the sum is divided by the number of days, we obtain what is known as the mean solar day. This is divided into 24 hours, each hour into 60 minutes and each minute into 60 seconds. The second or rather, the mean solar second as it is called, and which is 24 x 60 x 60 = 86^00 °f... | |
 | Patrick Moore - 2000 - 226 páginas
...star is given in seconds or minutes of arc. A full circle is divided into 360 degrees, each degree into 60 minutes and each minute into 60 seconds, so that one second of arc is a very small angle indeed. It is worth remembering that the distance between the two Pointers... | |
 | Sue Nelson, Richard Hollingham - 2004 - 280 páginas
...than 30 years. A solar day remains the time it takes for the Earth to revolve once on its axis. This day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. But rather like a wind-up watch or the battery in a digital watch, our own planet cannot always be... | |
 | Sir William Cecil Dampier Dampier - 1924 - 302 páginas
...day — the average length of the solar day throughout the year — is chosen as the standard unit. The mean solar day is divided into 24 hours, each...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... | |
 | Sir Robert Stawell Ball - 1909 - 274 páginas
...measurement of time. Expressed in sidereal time the mean solar day is 24 hours 3 minutes 56 '56 seconds. This mean solar day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. Owing to the irregularity of the Sun's movements we do not employ the Sun itself when thinking of our... | |
 | 1888 - 1056 páginas
...and 10 signs in the circle of 400 degrees. The earth revolves upon its axis once in a day, and the day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. I propose to divide the day into 20 hours, each hour into 100 minutes, each minute into 100 seconds,... | |
 | 1894 - 488 páginas
...the time of one rotation of the earth upon its axis, and is a little shorter than the solar day. Each day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds, the second being taken as the unit, as stated above. Time is usually measured by means of a clock,... | |
 | National Joint Industrial Council for the Flour Milling Industry - 1926 - 844 páginas
...cc, ie, 1 cc of water at 4 degrees C. weighs I gram. UNIT OF TIME. The basis is the mean day. This 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 work. Hence, we have defined the three fundamental... | |
| |
The mean solar day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. 
