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UT1

Universal Time

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

ΔT (timekeeping)

seconds, so ΔT = UTC − UT1 + (leap seconds) + 32.184 s. This can be rewritten as ΔT = (leap seconds) + 32.184 s − DUT1, where DUT1 is UT1 − UTC. The value of

Coordinated Universal Time

scientific research, navigation, and timekeeping, other standards, such as UT1 and International Atomic Time (TAI), are also used alongside UTC. UTC is

Leap second

(TAI), as measured precisely by atomic clocks, and observed solar time (UT1), which varies due to irregularities and long-term slowdown in the Earth's

Aries (astrology)

vernal equinox dates calculate phenomena: solstices/equinoxes, choosing UT1 and years 1800 through 2050. Orion, Rae (2011). Astrology for Dummies. Hoboken

Sidereal time

solar time (UT1) and sidereal time, the numerical value will be greater in sidereal time than in UT1, because sidereal days are shorter than UT1 days. The

Second

1⁄86400 of a rotation of the Earth, is still used by the Universal Time 1 (UT1) system. The current and formal definition in the International System of

Greenwich Mean Time

Time (UTC) or else to UT1; English speakers often use GMT as a synonym for UTC. For navigation, it is considered equivalent to UT1 (the modern form of mean

Earth

Reference Systems Service (IERS), is 86,164.0989 seconds of mean solar time (UT1), or 23h 56m 4.0989s. Earth's rotation period relative to the precessing

Time standard

scale designed to approximate UT1. UTC differs from TAI by an integral number of seconds. UTC is kept within 0.9 second of UT1 by the introduction of one-second