Výsledky vyhledávání - "C. Y. Hohenkerk"

Autor: L. V. Morrison, F. R. Stephenson, C. Y. Hohenkerk

Publikováno v: Proceedings of the International Astronomical Union. 14:160-162

Analysis of historical records of eclipses of the Sun and Moon between 720 BC and AD 1600 gives a measure of the time difference, TT − UT = ΔT. The first derivative in time along a smooth curve fitted to the values of Δ T measures the changes in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0dcff12649340219f13d1360efcbfcba
https://doi.org/10.1017/s1743921319003971

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Addendum 2020 to ‘Measurement of the Earth’s rotation: 720 BC to AD 2015’

Autor: M. Zawilski, F. R. Stephenson, C. Y. Hohenkerk, L. V. Morrison

Publikováno v: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 477:20200776

Historical reports of solar eclipses are added to our previous dataset (Stephenson et al. 2016 Proc. R. Soc. A 472 , 20160404 ( doi:10.1098/rspa.2016.0404 )) in order to refine our determination of centennial and longer-term changes since 720 BC in t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ca307f78d66e88ba20a08e9f607d7a15
https://doi.org/10.1098/rspa.2020.0776

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The Supplement from Measurement of the Earth's rotation: 720 BC to AD 2015

Autor: F. R. Stephenson, L. V. Morrison, C. Y. Hohenkerk

This material consists of the tables of the observational data prior to 1600, discussion of the comparative accuracy of Babylonian time intervals, a commentary on critical eclipses and a list of rejected observations. Lastly, a table of coefficients

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Time references in US and UK astronomical and navigational almanacs

Autor: C Y Hohenkerk, J L Hilton

Publikováno v: Metrologia. 48:S195-S199

An astronomical or navigational almanac can best be thought of as a device for connecting an observer with celestial objects. For an observer with a known position and time the almanac allows the observer to identify the celestial objects. Conversely

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https://doi.org/10.1088/0026-1394/48/4/s10

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Rotation matrix from the mean dynamical equator and equinox at J2000.0 to the ICRS

Autor: C. Y. Hohenkerk, J. L. Hilton

Publikováno v: Astronomy & Astrophysics. 413:765-770

Recommendation VII of Resolution A4 of the XXIst General Assembly of the International Astronomical Union (IAU 1992) states, in part, "... that the principal plane of the new conventional celestial reference system be as near as possible to the mean

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https://doi.org/10.1051/0004-6361:20031552

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Measurement of the Earth's rotation: 720 BC to AD 2015

Autor: F. R. Stephenson, L. V. Morrison, C. Y. Hohenkerk

Publikováno v: Proceedings. Mathematical, Physical, and Engineering Sciences

New compilations of records of ancient and medieval eclipses in the period 720 BC to AD 1600, and of lunar occultations of stars in AD 1600–2015, are analysed to investigate variations in the Earth’s rate of rotation. It is found that the rate of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ded175d333ff3c6321010ee572f7d2c1
https://doi.org/10.1098/rspa.2016.0404

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Commission 4: Ephemerides

Autor: E. M. Standish, J. Chapront, V. K. Abalakin, J.-E. Arlot, T. Fukushima, M.-F. He, C. Y. Hohenkerk, G. H. Kaplan, H. Kinoshita, G. A. Krasinsky, J. H. Lieske, H. Schwan, P. K. Seidelmann

Publikováno v: Transactions of the International Astronomical Union. 24:7-10

The Commission has established its own website (http://ssd.jpl.nasa.gov/iau-comm4/) containing the following main topics: InformationWhere to Obtain EphemeridesRecent Papers and Information Related to EphemeridesObservational Data(Measurements to whi

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https://doi.org/10.1017/s0251107x00002534

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The Equation of Time

Autor: C. Y. Hohenkerk, B. D. Yallop, David W. Hughes

Publikováno v: Monthly Notices of the Royal Astronomical Society. 238:1529-1535

Une equation qui donne l'equation du temps comme fonction du temps universel est developpee

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https://doi.org/10.1093/mnras/238.4.1529

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Distribution of sunspots 1874?1976

Autor: B. D. Yallop, C. Y. Hohenkerk

Publikováno v: Solar Physics. 68:303-305

A diagram of the distribution in latitude of sunspot groups during the period 1874–1976 is given. As an indication of sunspot activity, a diagram of the mean total daily sunspot areas for each synodic rotation is also given.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1aec27e8b0c209bd74eb824066ec693e
https://doi.org/10.1007/bf00156868

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