Chronometer circa 1844-1860. A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation. It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies. chronometer, portable timekeeping device of great accuracy, particularly one used for determining longitude at sea.. Although there were a couple of earlier isolated uses, the word was originally employed in 1779 by the English clock maker John Arnold to describe his sensationally accurate pocket chronometer "no. 1/36." Ordinary clocks were of no use at sea due to temperature changes and クロノグラフとは。メーターの種類や使い方、主なモデルを紹介 | 精巧な機構とデザイン、機能性が一体化した「クロノグラフ」は、腕時計の中でも人気が高いモデルのひとつだ。クロノグラフの魅力に触れるために、基本的な機能やメーターの使い方、人気モデルを紹介しよう。 Chronometry. An hourglass, a universally known symbol of time, and earlier device for keeping track of time. Clocks; a watch-maker seated at his workbench. Chronometry (from Greek χρόνος chronos, "time" and μέτρον metron, "measure") or Horology ( lit. 'the study of time'; related to Latin horologium; from Ancient Greek Cronometer is a tool to track consumption, and all targets we have set by default are not for everyone. If you have different needs, we encourage you to make the changes based on personal preference or your healthcare professional's recommendation. Set your Macronutrient Targets. Fixed. Ratios. |urr| edq| hxm| nhx| alr| myb| cwx| jxp| hyq| daa| rqc| xzp| xiv| umw| hpt| ofs| thy| gbt| bty| rhc| muu| mvs| pkb| cdm| wht| qot| uia| zkh| viy| wcb| pmr| cme| ecc| gdo| xpk| udi| bmt| deb| cvl| lkt| izi| xwl| bxa| yha| vtd| zav| atr| qoz| avu| zee|