Cosma / Communication / Knowledge / Realm / Chronology

We must not allow the clock and the calendar to blind us to the fact that each moment of life is a miracle and mystery. — H. G. Wells



National Institute of Standards and Technology (YouTube Channel)
National Institute of Standards and Technology (Official Website)


chronology : the science that deals with measuring time by regular divisions and that assigns to events their proper dates — Merriam-Webster   See also OneLook

time : (1) the thing that is measured as seconds, minutes, hours, days, years, etc. (2) a particular minute or hour shown by a clock — Merriam-Webster   See also OneLook

horology : the art of making instruments for indicating time — Merriam-Webster   See also OneLook

Illustrated Professional Dictionary of Horology (Federation of the Swiss Watch Industry)


Chronology chronology, any method used to order time and to place events in the sequence in which they occurred. The systems of chronology used to record human history, which are closely related to calendar systems, vary in scope, accuracy, and method according to the purpose, degree of sophistication, and skills of the peoples using them.. — Encyclopædia Britannica

Time is the indefinite continued progression of existence and events that occur in apparently irreversible succession from the past through the present to the future. It is a component quantity of various measurements used to sequence events, to compare the duration of events or the intervals between them, and to quantify rates of change of quantities in material reality or in the conscious experience. Time is often referred to as the fourth dimension, along with the three spatial dimensions. It has long been a major subject of study in religion, philosophy, and science, but defining it in a manner applicable to all fields without circularity has consistently eluded scholars. — Wikipedia


Glossary of Terms (Exactly What Is Time?)


Horology – The Index (National Association of Watch and Clock Collectors)
Exactly What Is Time?
Time and

Time (Eric Weisstein’s World of Scinece, Wolfram Research)
Date & Time Computations (Wolfram Alpha)



Talks about Time (TED: Ideas Worth Spreading)
Articles about Time (Big Think)

Time Quotes (BrainyQuote)




PhilosophyFile (Brady Haran, YouTube Channel)
Jonathan Tallant (University of Nottingham)

Philosophy of Time (Exactly What Is Time?)
Time (Stanford Encyclopedia of Philosophy)
Time (Internet Encyclopedia of Philosophy)




A Brief History of Time (Stephen Hawking, Official Site)
A Brief History of Time (Stephen Hawking, WorldCat)

Physics of Time (Exactly What Is Time?)
Timekeeping (Ask an Astronomer, Cornell University)
Time in Cosmology (Perimeter Institute for Theoretical Physics)




History is philosophy teaching by example, and also warning; its two eyes are geography and chronology. — James A. Garfield

Time (Dictionary of the History of Ideas)
Time and Measurement (Dictionary of the History of Ideas)

Development of Timekeeping and Time Systems (Horology – The Index)
A Walk Through Time: The Evolution of Time Management through the Ages (NIST Physical Measurement Laboratory)

Time (World History Encyclopedia)


DDC: 115 Time (Library Thing)
Subject: Time (Library Thing)

DDC: 529 Chronology (Library Thing)
Subject: Chronology (Library Thing)

DDC: 681.11 Horology (Library Thing)
Subject: Horology (Library Thing)

Subject: Time (Open Library)
Subject: Chronology (Open Library)
Subject: Timekeeping (Open Library)
Subject: Horology (Open Library)

LCC: BD 638 Time (UPenn Online Books)
LCC: CE Chronology (UPenn Online Books)
LCC: QB 209 Timekeeping (UPenn Online Books)
LCC: TS 540 Horology (UPenn Online Books)

LCC: BD 638 Time (Library of Congress)
Subject: Time (Library of Congress)

LCC: CE Chronology (Library of Congress)
Subject: Chronology (Library of Congress)

LCC: QB 209 Timekeeping (Library of Congress)
Subject: Timekeeping (Library of Congress)

LCC: TS 540 Horology (Library of Congress)
Subject: Horology (Library of Congress)

Subject: Time (WorldCat)
Subject: Chronology (WorldCat)
Subject: Timekeeping (WorldCat)
Subject: Horology (WorldCat)




MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources



Professional Organizations (Horology – The Index)


Time (The Science Geek)


Horology Periodicals (Horology – The Index)
The Horological Journal (British Horological Institute)

A Matter of Time (Scientific American Special Edition)

Time (JSTOR)


Galileo’s Pendulum: From the Rhythm of Time to the Making of Matter (Roger G Newton)

Book Reviews (Horology – The Index)


Bibliographies (Horology – The Index)
A Walk Through Time – Bibliography (NIST Physical Measurement Laboratory)


National Time Authorities (Horology – The Index)

US Time and Frequency Standards (Time & Frequency Division, National Institute of Standards & Technology)
Official U.S. Time and Other Useful Things (, NIST and VSNO)
Precise Time (U.S. Naval Observatory)




Time (Tim Hunkin, The Rudiments of Wisdom Encyclopedia)


OEDILF: The Omnificent English Dictionary In Limerick Form




Here are links to pages about closely related subjects.

Knowledge Realm

Geography Navigation, Map
Chronology Calendar, Clock

Realms Cosmological, Physical, Terrestrial, Anthropological, Mystical

See also Zoom



1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.