Use of ephemeris time in official almanacs and ephemerides Ephemeris time based on the standard adopted in 1952 was introduced into the Astronomical Ephemeris (UK) and the American Ephemeris and Nautical Almanac, replacing UT in the main ephemerides in the issues for 1960 and after.

Practical introduction took some time (see Use of ephemeris time in official almanacs and ephemerides) ephemeris time (ET) remained a standard until superseded in the 1970s by further time scales (see Revision).

This was in conformity with the ephemeris time scale adopted by the IAU in 1952.

Improved Lunar Ephemeris , US Government Printing Office, 1954.

Its successor time scales, such as TDT, as well as the atomic time scale IAT (TAI), were designed with a relationship that provides continuity with ephemeris time .

(4)Clemence's formula, now superseded by more modern estimations, was included in the original conference decision on ephemeris time.

G M Clemence (1971), The Concept of Ephemeris Time , Journal for the History of Astronomy , vol.2 (1971), pp.

W Markowitz, R G Hall, S Edelson (1955), Ephemeris time from photographic positions of the moon , Astronomical Journal , vol.

G M R Winkler and T C van Flandern (1977), Ephemeris Time, relativity, and the problem of uniform time in astronomy , Astronomical Journal , vol.82 (Jan. 1977), pp.

For practical purposes the length of the ephemeris second can be taken as equal to the length of the second of Barycentric Dynamical Time (TDB) or Terrestrial Time (TT) or its predecessor TDT.

'ESAE 1961' Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac ('prepared jointly by the Nautical Almanac Offices of the United Kingdom and the United States of America', HMSO, London, 1961).

W Markowitz, R G Hall, L Essen, J V L Parry (1958), Frequency of cesium in terms of ephemeris time , Physical Review Letters, vol.1 (1958), 105 107.

6, part 1, of Astronomical Papers prepared for the use of the American Ephemeris and Nautical Almanac (1895), at pages 1 169).

On September 8, 2001, Titania occulted a bright star (HIP106829) with a visible magnitude of 7.2 this was an opportunity to both refine the moon's diameter and ephemeris, and to detect any extant atmosphere.

Well, from time to time.

They appear from time to time.

Time.

Yes, it happens from time to time.

I meet him from time to time.

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She visits me from time to time.

Yes, that happens from time to time.

I see him from time to time.

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I get headaches from time to time.

She visits me from time to time.

So, I hope you had a Audience Nice time, time ED Time at.

Time after time I've invited them to come over and visit us but time and time again they've never come.

What time is it? What time is it?

They sacrifice family time. They sacrifice friend time.

Please write to me from time to time.

He wrote to me from time to time.

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Tom still calls me from time to time.

I bump into Tom from time to time.

We all need help from time to time.

Tom gets into trouble from time to time.

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