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Long-term fluctuations in the Earth’s rotation: 700 BC to AD 1990
Records of solar and lunar eclipses in the period 700 BC to AD 1600, originating from the ancient and medieval civilizations of Babylon, China, Europe and the Arab world, are amassed and criticallyExpand
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Optical observations of supernova 1993J from La Palma – I. Days 2 to 125
We present astrometric, photometric and spectroscopic observations of supernova 1993J in M81, obtained with the Isaac Newton Group telescopes and the Carlsberg Automatic Meridian Circle. The spectralExpand
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Historical Values of the Earth's Clock Error Δ and the Calculation of Eclipses
Numerous observations of the Moon, Sun and planets are recorded in ancient and medieval history. These observations which include many eclipses and lunar and planetary conjunctions frequently attractExpand
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THE HIPPARCOS CATALOGUE AS A REALISATION OF THE EXTRAGALACTIC REFERENCE SYSTEM
The paper describes the methods and observations by which the Hipparcos Catalogue was linked to the International Celestial Reference System (ICRS). The contributions of several groups represented inExpand
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Re-determination of the decade fluctuations in the rotation of the Earth in the period 1861–1978
Summary The ‘decade’ fluctuations in the Earth's rate of rotation are derived from a comparison of the universal time-scale, based on the Earth's diurnal rotation, with: (a) the dynamicalExpand
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Physical studies of asteroids. XXXI. Asteroid photometric observations with the Carlsberg Automatic Meridian Circle
Photometric observations of 74 asteroids obtained with the Carlsberg Automatic Meridian Circle between January 1990 and December 1993 are presented. The data from individual asteroid apparitions habeExpand
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Rotation of the Earth from AD 1663–1972 and the Constancy of G
TIMINGS of 40,000 lunar occultations of stars from 1943–1972 have recently been analysed to determine improvements to the Moon's orbital elements, and difference between the ephemeris (ET), universalExpand
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Fluctuations in the Earth's rotation since 1830 from high-resolution astronomical data
SUMMARY Fluctuations in the Earth's rotation since 1830, as evidenced by changes in the length of the day, are derived from astronomical data having subannual resolution. Before 1955.5, timings ofExpand
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