Universal Time (UT or UT1) is a time standard based on Earth's rotation. While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult. Therefore, UT1 is computed from a measure of the Earth's angle with respect to the International Celestial Reference Frame (ICRF), called the Earth Rotation Angle (ERA, which serves as a modern …

Universal is the adjective for universe. Universal may also refer to: Companies. NBCUniversal, a media and entertainment company Universal Animation Studios, an American Animation studio, and a subsidiary of NBCUniversal; Universal TV, a ...