Earth Rotation: Measurement of TT-UT, -720 to +1950

Autores
Morrison, L.V.; Hohenkerk, C.Y.; Stephenson, F.R.; Zawilski, M.
Año de publicación
2025
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
We present figures and tables of our results for DT=TT-UT in the period -720 to +1950 obtained principally from analyses of historical records of solar eclipses (-720 to +1600) and timings of lunar occultations ( + 1600 to + 1950) [1], These show changes in the Earth’s rate of rotation as measured in changes of the length of the day (lod). There is a long-term deceleration producing an increase in the lod of +1.72 ms cy-1. There are also centennial fluctuations in the lod of amplitude 3 ms. After +1600 the data are precise enough to reveal decade fluctuations of up to an amplitude of 4 ms.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Delta T
Length of Day
Earth's rotation rate
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-nd/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/192193
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/192193
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Earth Rotation: Measurement of TT-UT, -720 to +1950Morrison, L.V.Hohenkerk, C.Y.Stephenson, F.R.Zawilski, M.Ciencias AstronómicasDelta TLength of DayEarth's rotation rateWe present figures and tables of our results for DT=TT-UT in the period -720 to +1950 obtained principally from analyses of historical records of solar eclipses (-720 to +1600) and timings of lunar occultations ( + 1600 to + 1950) [1], These show changes in the Earth’s rate of rotation as measured in changes of the length of the day (lod). There is a long-term deceleration producing an increase in the lod of +1.72 ms cy-1. There are also centennial fluctuations in the lod of amplitude 3 ms. After +1600 the data are precise enough to reveal decade fluctuations of up to an amplitude of 4 ms.Facultad de Ciencias Astronómicas y Geofísicas2025-08info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/192193enginfo:eu-repo/semantics/reference/url/https://sedici.unlp.edu.ar/handle/10915/190232info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2026-04-23T11:55:44Zoai:sedici.unlp.edu.ar:10915/192193Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292026-04-23 11:55:44.96SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Earth Rotation: Measurement of TT-UT, -720 to +1950
title Earth Rotation: Measurement of TT-UT, -720 to +1950
spellingShingle Earth Rotation: Measurement of TT-UT, -720 to +1950
Morrison, L.V.
Ciencias Astronómicas
Delta T
Length of Day
Earth's rotation rate
title_short Earth Rotation: Measurement of TT-UT, -720 to +1950
title_full Earth Rotation: Measurement of TT-UT, -720 to +1950
title_fullStr Earth Rotation: Measurement of TT-UT, -720 to +1950
title_full_unstemmed Earth Rotation: Measurement of TT-UT, -720 to +1950
title_sort Earth Rotation: Measurement of TT-UT, -720 to +1950
dc.creator.none.fl_str_mv Morrison, L.V.
Hohenkerk, C.Y.
Stephenson, F.R.
Zawilski, M.
author Morrison, L.V.
author_facet Morrison, L.V.
Hohenkerk, C.Y.
Stephenson, F.R.
Zawilski, M.
author_role author
author2 Hohenkerk, C.Y.
Stephenson, F.R.
Zawilski, M.
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Delta T
Length of Day
Earth's rotation rate
topic Ciencias Astronómicas
Delta T
Length of Day
Earth's rotation rate
dc.description.none.fl_txt_mv We present figures and tables of our results for DT=TT-UT in the period -720 to +1950 obtained principally from analyses of historical records of solar eclipses (-720 to +1600) and timings of lunar occultations ( + 1600 to + 1950) [1], These show changes in the Earth’s rate of rotation as measured in changes of the length of the day (lod). There is a long-term deceleration producing an increase in the lod of +1.72 ms cy-1. There are also centennial fluctuations in the lod of amplitude 3 ms. After +1600 the data are precise enough to reveal decade fluctuations of up to an amplitude of 4 ms.
Facultad de Ciencias Astronómicas y Geofísicas
description We present figures and tables of our results for DT=TT-UT in the period -720 to +1950 obtained principally from analyses of historical records of solar eclipses (-720 to +1600) and timings of lunar occultations ( + 1600 to + 1950) [1], These show changes in the Earth’s rate of rotation as measured in changes of the length of the day (lod). There is a long-term deceleration producing an increase in the lod of +1.72 ms cy-1. There are also centennial fluctuations in the lod of amplitude 3 ms. After +1600 the data are precise enough to reveal decade fluctuations of up to an amplitude of 4 ms.
publishDate 2025
dc.date.none.fl_str_mv 2025-08
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
info:eu-repo/semantics/publishedVersion
Resumen
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dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/192193
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dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/reference/url/https://sedici.unlp.edu.ar/handle/10915/190232
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
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dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
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reponame_str SEDICI (UNLP)
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instname_str Universidad Nacional de La Plata
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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