What is the approximate difference between Universal Time and Ephemeris Time today (2017)?

Expert Solution

Coordinated Greenwich Time (UTC) is that the basis for the time system employed in daily life. so as to stay Greenwich Time in line with the Earth's slightly variable rate of rotation, leap seconds are sometimes inserted into Greenwich Time. TT (TT) runs at an equivalent rate however has no leap seconds. each are documented to the rotating Earth.

Ephemeris Time (ET) is that the variety of seconds since time of day (ET) on Jan one, 2000. ET is documented to the star system's center of mass (center of mass). It runs at an equivalent rate as Barycentric Time

This operate is correct at intervals concerning 0.000030 seconds once 1972, if the input is that correct. Before 1972, the accuracy could also be additional restricted by uncertainty in Delta-T. See the operate DeltaT for details.

This operate finds the distinction between ET and Greenwich Time for the user-specified dates/times. Note that what it extremely returns is comparable to the distinction (ET-UTC, in seconds) between the input Greenwich Time statesman Date (converted from days to seconds) and therefore the corresponding TT (in seconds):

genius_generous answered 2 years ago

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