Skip to main content Print Version Back Content Start Social Network End Social Network ICMS better copy from here Astronomical Time and Atomic Time Written by: LAU Dick-shum       September 2013 Basically there are two types of time standards.  One is based on astronomy and is called "Astronomical Time".  The other is based on the frequency of atomic oscillations and is called "Atomic Time". Astronomical Time is based on the repetition of astronomical events for setting frequency standards.  For example, the occurrence of day and night is caused by the rotation of the Earth, and seasons by the Earth revolving around the Sun.  In the past, people used sundial to indicate the time derived from the sun's apparent position, and was referred to as "Apparent Solar Time".  However...

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Home Moments Search query Search Twitter Remove In this conversation Verified account Protected Tweets @ Suggested users Verified account Protected Tweets @ Verified account Protected Tweets @ Language: English Bahasa Indonesia Bahasa Melayu Català Čeština Dansk Deutsch English UK Español Filipino Français Hrvatski Italiano Magyar Nederlands Norsk Polski Português Română Slovenčina Suomi Svenska Tiếng Việt Türkçe Ελληνικά Български език Русский Српски Українська мова עִבְרִית العربية فارسی मराठी हिन्दी বাংলা ગુજરાતી தமிழ் ಕನ್ನಡ ภาษาไทย 한국어 日本語 简体中文 繁體中文 Have an account? Log in Have an account? Remember me · Forgot password? New to Twitter? Sign up justinmduke's profile Justin Duke @ j...

BEGIN WAYBACK TOOLBAR INSERT NEXT/PREV MONTH NAV AND MONTH INDICATOR OCT NOV DEC NEXT/PREV CAPTURE NAV AND DAY OF MONTH INDICATOR 21 NEXT/PREV YEAR NAV AND YEAR INDICATOR 2010 2011 2012 74 captures 24 Jan 05 - 14 Jan 17 Close Help END WAYBACK TOOLBAR INSERT Style: Fantastic Metropolis Division by Zero By Ted Chiang Fiction · Reprints · December 13, 2003 Last modified: Sun, 22 Aug 2004 21:49:49 -0600 Dividing a number by zero doesn’t produce an infinitely large number as an answer. The reason is that division is defined as the inverse of multiplication; if you divide by zero, and then multiply by zero, you should regain the number you started with. However, multiplying infinity by zero produces only zero, not any other number. There is nothing which can be multiplied by zero to produce a n...

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CentralNotice From Wikipedia, the free encyclopedia Jump to: navigation , search For other uses, see Hum (disambiguation) . The Hum is a phenomenon, or collection of phenomena, involving widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise not audible to all people. Hums have been widely reported by national media in the UK and the United States. The Hum is sometimes prefixed with the name of a locality where the problem has been particularly publicized: e.g., the " Bristol Hum", the " Taos Hum" or the " Windsor Hum". It is unclear whether it is a single phenomenon; different causes have been attributed. In some cases, it may be a manifestation of tinnitus . 1 Description 2 History 3 Possible explanations 3.1 Mechanical devices 3.2 Tinnitus 3.2.1 Spontaneous otoacoustic emissions 3.3 Fish 4 Media coverage 5...

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