Uncertainty in determining the true solar day Metrological Concepts Applied to Astronomy
Abstract
In this work, we discuss, from a metrological point of view, the measurement of the astronomical time interval, known as "true solar day" which, through History, was a unit of time widely used by mankind. The intention is to apply some concepts of Metrology to a phenomenon strongly related to our lives. The software Stellarium, which allows simulating the movement of the celestial bodies, was employed to measure the duration of the day in regular intervals along one year. The obtained results are presented, compared against the values from the Yearbook of the National Observatory – RJ, analyzed and discussed.
Keywords: Metrology; Astrometry; Astronomy, Uncertainty.
References
ALDER, K. A medida de todas as coisas. Rio de Janeiro: Objetiva, 2003.
DETERMINING the earth’s size. Disponível em: <http://www.geo.hunter.cuny.edu/~jochen/
gtech201/Lectures/Lec6concepts/Datums/Determining%20the%20earths%20size.htm>. Acesso
em: 21 set. 2018.
ERATOSTHENES greek scientist. In: Encyclopaedia Britannica. Disponível em:
britannica.com/biography/Eratosthenes>. Acesso em: 21 set. 2018.
HEWLETT-PACKARD. Application Note 200-3, Fundamentals of Time Interval Measurements.
[S.l.]: HP, 1997.
INSTITUTO NACIONAL DE METROLOGIA, QUALIDADE E TECNOLOGIA. Centro de Capacitação.
Avaliação de dados de medição: Guia para a expressão de incerteza de medição - GUM 2008.
Duque de Caxias: Inmetro, 2012.
OBSERVATÓRIO NACIONAL. Anuário 2018. Seção C - Posições Aparentes do Sol, Lua e Planetas.
Rio de Janeiro: ON, 2018.
SANTIAGO, B., SALVIANO, A. Astronomia Geodésica - Posicionamento pelas Estrelas. Porto
Alegre: Universidade Federal do Rio Grande do Sul, 2005. 160 p.
STELLARIUM. Faq. Disponível em: <https://github.com/Stellarium/stellarium/wiki/FAQ>. Acesso
em: 21 set. 2018.
