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

@article{Morrison2021Addendum2T,
  title={Addendum 2020 to ‘Measurement of the Earth’s rotation: 720 BC to AD 2015’},
  author={Leslie V. Morrison and Francis Richard Stephenson and Catherine Y. Hohenkerk and Marek Zawilski},
  journal={Proceedings of the Royal Society A},
  year={2021},
  volume={477}
}
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 the rate of rotation of the Earth. The revised observed deceleration is −4.59 ± 0.08 × 10−22 rad s−2. By comparison the predicted tidal deceleration based on the conservation of angular momentum in the Sun–Earth–Moon system is −6.39 ± 0.03 × 10−22 rad s… 

Figures and Tables from this paper

The Variable Earth’s Rotation in the 4th–7th Centuries: New ΔT Constraints from Byzantine Eclipse Records

As one of the greatest astronomical spectacles, total solar eclipses have long been a subject of scientific interest and have been recorded by numerous civilizations over the millennia. These records

Secular changes in length of day: Effect of the mass redistribution

In this paper the secular change in the length of day due to mass redistribution effects is revisited using the Hamiltonian formalism of the Earth rotation theories. The framework is a two-layer

Accuracy of medieval Chinese and Middle-Eastern timings of eclipses

Analysis of 111 Chinese timings of solar and lunar eclipses in the period AD 434–1280 and of 56 Middle-Eastern timings in AD 829–1020 reveals that their accuracy approached the limiting resolution of

Accuracy of eclipse records in the Anglo-Saxon Chronicle

From a comparison with calculation of the dates and descriptions of the allusions to lunar and solar eclipses recorded in the Anglo-Saxon Chronicle, we confirm the identifications of the eclipses

Hang on a second…

Leslie Morrison and Catherine Hohenkerk consider the future direction of the leap second

Calculation of Moon Phases and 24 Solar Terms

This document explains the method used to compute the times of the moon phases and 24 solar terms. These times are important in the calculation of the Chinese calendar. See this page for an

References

SHOWING 1-10 OF 18 REFERENCES

The Provenance of Early Chinese Records of Large Solar Eclipses and the Determination of the Earth’s Rotation

An analysis of the tracks of total and annular solar eclipses crossing China reveals that most of the reports of such eclipses in the treatises in the dynastic histories from 206  bc to ad 1368 were

Historical eclipses and the earth's rotation

TLDR
Analysis of various observations of solar eclipses reveals that over the past 2,500 years the average rate of lengthening of the day has been 1.7 milliseconds per century, significantly less than the tidal figure of 2.3.

Rome and the Total Solar Eclipse of BC 188 July 17

Using detailed knowledge of the Earth’s variable rotation, we conclude that the eclipse of BC 188 July 17 was total at Rome, and that Livy’s historical account of the darkness that befell the city in

Secular tidal changes in lunar orbit and Earth rotation

Small tidal forces in the Earth–Moon system cause detectable changes in the orbit. Tidal energy dissipation causes secular rates in the lunar mean motion n, semimajor axis a, and eccentricity e.

The Planetary and Lunar Ephemerides DE430 and DE431

The research described in this publication was carried out by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space

International Astronomical Union.

THE meeting of the International Astronomical Union at Rome on May 2–10 must be considered an unqualified success. The unique interest of the selected meeting-place was doubtless a useful auxiliary

Explanatory Supplement to the Astronomical Almanac

Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical AlmanacTimeInfrared Astronomical Satellite Serendipitous Survey CatalogInfrared Astronomical Satellite

Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften in Wien

DigiZeitschriften e.V. gewährt ein nicht exklusives, nicht übertragbares, persönliches und beschränktes Recht auf Nutzung dieses Dokuments. Dieses Dokument ist ausschließlich für den persönlichen,

The Collection of texts Containing the Historical Observations for the Solar Eclipses for Europe and the Near East. Unpublished

  • 2020

720 BC to AD 2015

  • Proc. R. Soc. A 472, 20160404