Example image of eyePlorer eyePlorer map for 'International Atomic Time': Coordinate time Earth French language Geoid Proper time Time standard Coordinated Universal Time Terrestrial Time Leap second Gregorian calendar Julian day Universal Time Atomic clock Frequency Caesium International System of Units Second Present Time code National Physical Laboratory (United Kingdom) United States Naval Observatory International Bureau of Weights and Measures Canonical Epoch (reference date) Astronomy 1 E-2 s International Time Bureau Time signal Compromise Navigation Altitude Gravitational time dilation Sea level Barycentric Coordinate Time Geocentric Coordinate Time Ephemeris time Temperature Thermal radiation Absolute zero Network Time Protocol Precision Time Protocol Time and frequency transfer Two-Way Satellite Time and Frequency Transfer 1 E1 s Broadcast relay station History of timekeeping devices Unix time ΔT Tidal acceleration Equinox (celestial coordinates)