precise time and time interval造句

• "' Precise Time and Time Interval "'( "'PTTI "') is a Standard which details a mechanism and waveform for distributing highly accurate timing information.
• The United States Naval Observatory no longer obtains significant astrometric observations, but it continues to be a major authority in the areas of Precise Time and Time Interval, star catalogs ) in the Astronomical Almanac, The Nautical Almanac, and on-line.