Download or read book Time Service of the U S Naval Observatory Washington written by Albertson Van Zo Post and published by . This book was released on 1888 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time and Frequency Activities at the U S Naval Observatory written by and published by . This book was released on 2007 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S. Naval Observatory (USNO) has provided timing for the Navy and the Department of Defense since 1830 and, in cooperation with other institutions, has also provided timing for the United States and the international community. Its Master Clock (MC) is the source of UTC (USNO), the USNO's realization of Coordinated Universal Time (UTC), which has stayed within 5 ns RMS of UTC since 1999. The data used to generate UTC (USNO) are based upon 73 cesium and 21 hydrogen maser frequency standards in three buildings at two sites. The USNO disseminates time via voice, telephone modem, LORAN, Network Time Protocol (NTP), GPS, and Two-Way Satellite Time Transfer (TWSTT). The USNO would not be able to meet all the requirements of its users had it kept to the same technology it had 10 years ago; this paper describes some of the changes being made to meet the future needs for precision, accuracy, and robustness. Further details and explanations of our services can be found on-line or by contacting the author directly.
Download or read book Report on the Time and Frequency Activities of the Time Service Department of the U S Naval Observatory written by and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Almost every aspect of USNO operations is being upgraded with a view to improving the stability and robustness of our Master Clock. One important motivation for this effort is the projected requirements of many real-time users, the best known among them being GPS.
Download or read book The Determination of Universal Time at the U S Naval Observatory written by Dennis D. McCarthy and published by . This book was released on 1976 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Directorate of Time written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the Directorate of Time at the U.S. Naval Observatory (USNO) in Washington, D.C. Notes that the Directorate is the official source of time used in the United States. Describes U.S. Naval Observatory timekeeping, which is based on an ensemble of cesium beam and hydrogen master atomic clocks. Includes a brief history of timekeeping at the USNO and information on the National Earth Orientation Service, Time Service Department (Time Scales Division), network time services, and the Time Service Substation (Florida).
Download or read book The Naval Observatory Time Service written by United States Naval Observatory and published by . This book was released on 1950 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time Service of the U S Naval Observatory written by Julius Frederick Hellweg and published by . This book was released on 1932* with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coordinates of U S Naval Observatory Installations written by United States Naval Observatory. Coordinates Committee and published by . This book was released on 1975 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Literature 1986 Part 1 written by Prof. Dr. Roland Wielen and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 1122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Standards of Time and Frequency in the U S A written by James Allen Barnes and published by . This book was released on 1974 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Literature 1987 Part 1 written by S. Böhme and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 1300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astronomy and Astrophysics Abstracts aims to present a comprehensive documen tation of the literature concerning all aspects of astronomy, astrophysics, and their border fields. It is devoted to the recording, summarizing, and indexing of the relevant publications throughout the world. Astronomy and Astrophysics Abstracts is prepared by a special department of the Astronomisches Rechen-Institut under the auspices of the International Astronomical Union. Volume 43 records literature published in 1987 and received before August 15, 1987. Some older documents which we received late and which are not surveyed in earlier volumes are included too. We acknowledge with thanks contributions of our colleagues all over the world. We also express our gratitude to all organiza tions, observatories, and publishers which provide us with complimentary copies of their publications. Starting with Volume 33, all the recording, correction, and data processing work was done by means of computers. The recording was done by our technical staff members Ms. Helga Ballmann, Ms. Beate Gobel, Ms. Monika Kohl, Ms. Sylvia Matyssek, Ms. Doris Schmitz-Braunstein, Ms. Utta-Barbara Stegemann. Mr. Jochen Heidt and Mr. Kristopher Polzine supported our task by careful proof reading. It is a pleasure to thank them all for their encouragement. Heidelberg, October 1987 The Editors Contents Introduction . . . . . . . . . . . 1 Concordance Relation: PHYS-AAA 3 Abbreviations 5 Periodicals, Proceedings, Books, Activities 001 Periodicals . . . . . . . . . . . 10 002 Bibliographical Publications, Documentation, Catalogues, Data Bases 50 003 Books ...... .
Download or read book 100 Years of Precise Time written by Whitney H. Treseder and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reflections on Ten Years of Network Time Service written by and published by . This book was released on 2005 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The year 2004 marks the 10th anniversary since the start of U.S. Naval Observatory (USNO) time dissemination on the Internet using the Network Time Protocol (NTP). In 1994, our service was inauspicious: two 50MHz/32MB servers on a 56kb WAN link handling one packet every 17 seconds. Today, three servers in Washington, D.C., process over five thousand packets per second from millions of clients across the U.S. and 63 other nations. At the USNO Alternate Master Clock at Schriever AFB, Colorado, two additional servers provide NTP. Seventeen USNO servers with embedded GPS provide U.S. regional coverage from Alaska to Hawaii, from Washington state to Florida, from southern California to Maine. For the past 6 years, USNO has provided time service on the SIPRNET from Washington, D.C., and Schriever AFB. SIPRNET timing will soon expand with remote SAASM GPS servers. Throughout its history USNO, with the assistance of cooperating agencies, has provided free public time dissemination, from time balls to telegraphic time, wireless broadcasts, telephone time, LORAN, GPS, and Internet time. NTP is lightweight, reliable, accurate, and robust. Freely distributed, it has been ported to numerous devices and operating systems. The architecture of NTP is permanently in evolutionary development and in remote system maintenance.
Download or read book United States Naval Observatory written by United States Naval Observatory and published by . This book was released on 1993 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The 22nd Annual Precise Time and Time Interval PTTI Applications and Planning Meeting written by and published by . This book was released on 1990 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Precise Time and Time Interval PTTI Applications and Planning Meeting written by and published by . This book was released on 1992 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synopsis of the Report of the Superintendent of the United States Naval Observatory written by United States Naval Observatory and published by . This book was released on 1884 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
