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As a result of the Earth's rotation, any fixed star makes a full revolution around the pole star in 23 hours and 56 minutes and therefore can be used as an hour hand. The 4-minute difference between the solar day and sidereal day requires a correction of this giant clock based on the date of observation, and nocturnal helps to apply this ...
Wikijunior:Tell Time Clock Coloring Book/All Pages Metadata This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
Printable version; In other projects ... Astronomical clocks (6 C, 10 P) E. Equinoxes (2 C, ... Ramesside star clocks; Relative hour;
It is an orange giant star of spectral type K2III that has swollen to around 11 times the diameter of the Sun, having spent much of its life as a white main-sequence star. [14] At an estimated 1.55 times the mass of the Sun , [ 15 ] it is radiating 38 times the Sun's luminosity from its photosphere at an effective (surface) temperature of 5,028 K .
De Dondi's clock was a seven-faced construction with 107 moving parts, showing the positions of the sun, moon, and five planets, as well as religious feast days. [10] Both these clocks, and others like them, were probably less accurate than their designers would have wished.
A merkhet (Science Museum, London)The merkhet or merjet (Ancient Egyptian: mrḫt, 'instrument of knowing' [1]) was an ancient surveying and timekeeping instrument. It involved the use of a bar with a plumb line, attached to a wooden handle. [2]
Star chart of the south polar projection for Chinese astronomer Su Song's (1020–1101) celestial globe. During the Song dynasty (960–1279), the Chinese astronomer Su Song wrote a book titled Xin Yixiang Fa Yao (New Design for the Armillary Clock) containing five maps of 1,464 stars. This has been dated to 1092.
A graphical view of the Cosmic Calendar, featuring the months of the year, days of December, the final minute, and the final second. The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.