Universal Time (UT1)

Bodies, frames & concepts

• Sidereal Time
• Coordinated Universal Time (UTC)

Across celestial mechanics

• The Leap Second
• Sidereal Time

Knowledge connections

• Associated withSidereal Time
• Associated withCoordinated Universal Time (UTC)
• Associated withThe Leap Second
• Associated withSidereal Time
• Associated withEarth Orientation Parameters
• Associated withInternational Earth Rotation and Reference Systems Service (IERS)

Sources

Facts on this topic will be cited from these primary and reference sources.

• US Naval ObservatoryUnited States Naval Observatory

  Precise time, almanac data, Sun/Moon rise-set, and phases.