Time (book) touches upon nearly every topic in some way. Some of the most relevant are below:
A chronometer watch is a watch tested and certified to meet certain precision standards. In Switzerland, only timepieces certified by the COSC may use the word 'Chronometer' on them. However, numerous prominent Swiss watch manufacturers do not submit their movements for COSC certification, although such movements would probably easily qualify as chronometers under the COSC certification rules.
The term chronometer is also used to describe a marine chronometer used for celestial navigation. The marine chronometer was invented by John Harrison in 1730. This was the first iteration of a series of chronometers which enabled accurate marine navigation. For the next 250 years, an accurate chronometer was essential to any kind of marine or air navigation until the implementation of global satellite navigation at the end of the 20th century. The marine chronometer is no longer used for navigation.
Portal:Time/Selected Article archive/December 2017
Did you know...
...that the second was known as a "second minute", the second small division of an hour?
...that the second is defined as the duration of 9,192,631,770 oscillations between the two hyperfine levels of the ground state in the Cesium-133 atom?
...that the smallest unit of time that could ever be measured is the Planck time (~ 5.4 × 10−44 seconds)?
..that despite Herodotus's claim that the sundial was invented in Babylon, the oldest known example is from Egypt?
... that merkhets were Ancient Egyptian timekeeping devices that tracked the movement of certain stars over the meridian in order to ascertain the time during the night, when sundials could not function?
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|Tu ne quaesieris, scire nefas, quem mihi, quem tibi
||Leuconoe, don't ask — it's dangerous to know —
|finem di dederint, Leuconoe, nec Babylonios
||what end the gods will give me or you. Don't play with Babylonian
|temptaris numeros. ut melius, quidquid erit, pati.
||fortune-telling either. Better just deal with whatever comes your way.
|seu pluris hiemes seu tribuit Iuppiter ultimam,
||Whether you'll see several more winters or whether the last one
|quae nunc oppositis debilitat pumicibus mare
||Jupiter gives you is the one even now pelting the rocks on the shore with the waves
|Tyrrhenum: sapias, vina liques et spatio brevi
||of the Tyrrhenian sea — be smart, drink your wine. Scale back your long hopes
|spem longam reseces. dum loquimur, fugerit invida
||to a short period. Even as we speak, envious time
|aetas: carpe diem quam minimum credula postero.
||is running away from us. Seize the day, trusting little in the future.