| Today\'s_Calendar_and_Clock_Page Information on all things relating to calendars, dates, holidays, and time. Find today's date on several different cultural and religious calendars. Includes section on Celestial data, countdown cloc |
| United_States_Code Weights, measures and standard time. |
| U_S__Time_Zones History of standard time in the U.S. |
| A_Walk_Through_Time Evolution of timekeeping through the centuries. |
| BloomsburyMagazine_Research_Centre Offers literature reference searches powered by bloomsbury reference books. |
| Book_Sale_Finder Guide to used book fairs and sales across the USA. |
| Centre_for_the_History_of_the_Book History, projects, and events. |
| Creative_Nonfiction_Magazine Journal includes online essays and book reviews as well as links for the Goucher College MFA in Creative Nonfiction. |
| Instruction_Manuals_UK Instruction manuals for products sold in the United Kingdom. |
| International_ISBN_Agency Includes a user's manual, prefix ranges, details of group agencies, publications, reports, and news. |
| ISBN_Tools Information and tools for using International Standard Book Numbers. Scan them with a CueCat, look them up, or search them. |
| ISBN_org Enables applications to be made for ISBNs, SANs, and ISMNs in the United States and Puerto Rico, and provides information about the standards. |
| Library_of_Economics_and_Liberty Economics classics online, featured essays, letters to the editor, and data links by topic. |
| Nonfiction___Religion_Book_Reviews Collection of reviews by Skylar Hamilton Burris. |
| Resource_Central_-_Books_Online Resource links in finding books on the net. |
| Waddleton_Chronology Attempt to collect and record all books having colour-printed illustrations or decorations from 15th century up to 1893. |
| The_Almanac_News A source for local news for citizens of Palo Alto and Mountain View communities. |
| Almanac_Online Companion to National Public Broadcasting's award-winning radio and television programs: art, music, history, and current events. |
| CNN_Daily_Almanac Provides daily briefs of historical events, previews of currently developing stories, and links to related sites. |
| Community_Almanac Online version of America-wide almanac for small urban communities. |
| Computer_Almanac Collection of numbers relevant to computers, along with references |
| Computer_Industry_Almanac An annual reference guide to the computer industry. Thousands of links. |
| Gary_Price_Fast_Facts Compilation of quick reference resources, including almanacs, statistics, and fact books. |
| Her_Majesty\'s_Nautical_Almanac_Office Produces the Astronomical Almanac, the Nautical Almanac, Astronomical Phenomena, the Star Almanac and the UK Air Almanac. |
| J__Grubers_Hagerstown_Town_and_Country_Farmers_Almanack Weather predictions, garden, health and home, who's who and astronomy. |
| The_Moron\'s_Almanac Humorous take on almanacs. Compares two unrelated events on their anniversary. |
| University_of_Pennsylvania_Almanac Compilation of information on politics, social studies and history. |
| The_World_Almanac Features online ordering of the print edition, today in history, and today's birthdays. |
| American_Society_of_Indexers_-_Thesauri_Online Annotated directory. |
| Bartleby_com__Reference Includes "Roget's International Thesaurus of English Words and Phrases" and Houghton-Mifflin's "Roget's II: The New Thesaurus," third edition. |
| Germ Searchable WordNet and Roget's Thesaurus with meaning trees. |
| HASSET Provides direct term search followed by hierarchical and other types of browsing. Based on a UNESCO thesaurus. |
| Historical_Thesaurus_of_English Contains the vocabulary of English from the earliest written records to the present, with known recorded dates of usage, taken from the Oxford English Dictionary. |
| INGRID_Library_Thesaurus Allows direct term search with results hyperlinked to broader and narrower search terms. Available in English and Estonian. |
| Lexical_Freenet Search for relationships between words and concepts that might never have occurred to you before. |
| Phrases_Thesaurus A resource for writers. Enter a single word and it will return a list of phrases and sayings that are related to the word in some way. In English. |
| Roget\'s_Interactive_Thesaurus Roget's Thesaurus of English words and phrases. |
| Roget\'s_International_Thesaurus_of_English_Words_and_Phrases Online publication of this popular thesaurus made available by Bartleby.com. |
| Roget\'s_Thesaurus_-_As_distributed_by_Project_Gutenberg E-text of Roget's Thesaurus No. Two, which is derived from the version of Roget's Thesaurus published in 1911. |
| Sybrina\'s_Phrase_Thesaurus A creative phrase tool for creative writers of any genre including college students, people just learning English, people wanting to improve their communication skills, artistic professionals and othe |
About the Division
The Time and Frequency Division, part of NIST's
Physics Laboratory, maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology.
What we do
Services
The division broadcasts standard time and frequency signals using radio, Internet, and telephone links. These signals synchronize millions of clocks every day.
The OfficialUnited States Time
Information about WWVBRadio Controlled Clocks
Daylight Saving Time Rules(DST began March 9th, 2008)
NIST Demonstrates Miniature Atomic Clock
NIST researchers have demonstrated a minuscule atomic clock with inner workings about the size of a grain of rice and potential applications in atomically precise timekeeping in portable, battery-powered devices for secure wireless communications, more precise navigation, and other applications. The "physics package" of the clock, believed to be the smallest in the world, is about 1.5 millimeters on a side and about 4 millimeters tall, consumes less than 75 thousandths of a watt, and has a stability of about one part in 10 billion, equivalent to a clock that would neither gain nor lose more than a second in 300 years.
NIST researchers are also demonstrating the potential to fabricate and assemble the physics package using the low-cost, mass-production techniques used to make semiconductor devices, which should eventually lead to a complete atomic clock about 1 cubic centimeter in size (about the size of a pencil eraser) powered by a battery. Such miniature atomic clocks are not intended to compete for accuracy and stability with the world’s most accurate atomic clocks such as the NIST-F1 cesium fountain atomic clock, but could make dramatic improvements in the many consumer and military electronic devices that rely on stable and accurate timing for wireless communications, navigation, and other applications. Please click here for more information.
The NIST chip-scale atomic clock program is supported by NIST and the Defense Advanced Research Projects Agency (DARPA).
National Institute of Standards and Technology
Division 847
325 Broadway
Boulder, CO 80305
Web site comments and general technical questions: Michael Lombardi
General NIST inquiries:
Public Inquiries Unit:
(301) 975-NIST (6478)
TTY (301) 975-8295
