Solar Physics

, Volume 240, Issue 1, pp 165–175 | Cite as

Two Early Sunspots Observers: Teodoro de Almeida and José Antonio Alzate

  • J. M. Vaquero
  • R. M. Trigo
  • M. C. Gallego
  • M. A. Moreno-Corral
Article

Abstract

We present the sunspot ideas and observations of the 18th century Portuguese scholar Teodoro de Almeida (1722 – 1804) and Mexican scientist José Antonio Alzate (1737 – 1799). We describe the implications of dating a single sunspot observation performed by Almeida in the early 1760s, during the maximum of cycle number 1. A possible solar cycle peak in 1760 (instead of 1761) is investigated. We present several observations of sunspots obtained by Alzate during 1769 (partially associated with the Venus and Mercury transits) and also on 20 July 1786. We estimate 100±34 as the Group Sunspot Number for this date. These records were unknown and, therefore, not included in the database compiled by Hoyt and Schatten (1998).

Keywords

Solar Activity Solar Cycle Solar Phys Sunspot Number Aula 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 2007

Authors and Affiliations

  • J. M. Vaquero
    • 1
  • R. M. Trigo
    • 2
    • 3
  • M. C. Gallego
    • 4
  • M. A. Moreno-Corral
    • 5
  1. 1.Departamento de Física AplicadaEscuela Politécnica, Universidad de ExtremaduraCáceresSpain
  2. 2.Centro de GeofísicaUniversidad de LisboaLisbonPortugal
  3. 3.Departamento de Eng. CivilUniversidad LusófonaLisbonPortugal
  4. 4.Departamento de Física, Facultad de CienciasUniversidad de ExtremaduraBadajozSpain
  5. 5.Instituto de AstronomíaUniversidad Nacional Autónoma de MéxicoCampus EnsenadaMexico

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