Observing UT1-UTC with VGOS

The De nition of UTC

The current de nition of Coordinated Universal Time (UTC) is related to the unpredictable, variable rotation rate of the Earth. This is accomplished by irregular insertions of leap seconds, creating unpredictable discontinuities in UTC. With the increasing importance of a continuous, uniform time scale for users, it is appropriate to re-examine the current de nition of this time scale. There ar...

Connected Vehicles- Infrastructure UTC

The goal of the Infrastructure Safety Assessment in a Connected Vehicle Environment project was to develop a method to identify infrastructure safety “hot spots” using connected vehicle data. The premise was to show that using connected vehicle basic safety messages to detect hot spots could allow for a quicker detection than traditional methods using police-reported crashes. This is because th...

REQUIREMENTS FOR UTC AND CIVIl

Replicating UTC(NIST) at Remote Sites

The National Institute of Standards and Technology (NIST) is deploying disciplined oscillators that are referenced to the UTC(NIST) time scale through common-view observations of Global Positioning System (GPS) satellites. We present measurement results from four NIST disciplined oscillators (NISTDOs), three located in the United States, and one located in Concepción, Chile. These devices repli...

An Inventory of UTC Dependencies for IRAF

The Image Reduction and Analysis Facility is a scientific image processing package widely used throughout the astronomical community. IRAF has been developed and distributed by the National Optical Astronomy Observatory in Tucson, Arizona since the early 1980’s. Other observatories and projects have written many dozens of layered external application packages. More than ten thousand journal art...