Example image of eyePlorer eyePlorer map for 'Time standard': Rate Time Standardization Time scale Clock Ephemeris time Atomic clock International Atomic Time Day Second Hour Minute Year Meridian Solar time Ecliptic Equation of time Sidereal time Royal Observatory, Greenwich International Meridian Conference Prime Meridian Universal Time Coordinated Universal Time Coordinate time Dynamical time scale International Astronomical Union International System of Units Jet Propulsion Laboratory Development Ephemeris TDT TT TCB TCG Jet Propulsion Laboratory Terrestrial Time Barycentric Dynamical Time Geocentric Coordinate Time Barycentric Coordinate Time Leap second Nadir Julian day United States Naval Observatory Frequency averaging Half-month Marine chronometer Primary time standard Radio clock Time from NPL Event (philosophy) National Institute of Information and Communications Technology Micro hydro