The influence of the orographic environment in the study of ancient total solar eclipses in the vicinity of sunrise and sunset: an iberian case study
[EN] The Delta T parameter is used in many calculations related to celestial mechanics, and from it, secular changes of the LOD (Length of Day) can be obtained. However, this parameter cannot be calculated a priori since it depends on factors that could be classified as random, and only after the as...
| Autores: | , , |
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| Formato: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Recursos: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:dnet:riunet______::6065c61f5837d0a81cb70473928b16e0 |
| Acesso em linha: | https://riunet.upv.es/handle/10251/234699 |
| Access Level: | acceso abierto |
| Palavra-chave: | Astronomical sources History of astronomy Medieval Astronomy Solar eclipses |
| Resumo: | [EN] The Delta T parameter is used in many calculations related to celestial mechanics, and from it, secular changes of the LOD (Length of Day) can be obtained. However, this parameter cannot be calculated a priori since it depends on factors that could be classified as random, and only after the astronomical use of the telescope can precise values be obtained. Different astronomical phenomena have been used for calculations in pre-telescopic times, giving preference to total solar eclipses, and to a lesser extent to annular eclipses, lunar eclipses and lunar occultations. Focusing on the first phenomenon, total solar eclipses, provides a Delta T value whose precision is given by factors such as whether the observing location is precisely known and whether it was single or multiple. In the present work, we intend to analyse a total solar eclipse that, supposedly, was seen and recorded in C & oacute;rdoba on 17 June AD 912. We will see how a simple study provides us with a range of values for Delta T that are consistent with those obtained by other authors. But then, when we introduce local data into the analysis, such as the orography of the observing location, we reach conclusions that will lead us to modify transcendental elements relating to this phenomenon. Originally, the observing location was taken for granted. |
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