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Authors
Abstract(s)
A presente dissertação aborda os conceitos teóricos e algoritmos necessários para o
desenvolvimento de uma rotina de obtenção de coordenadas celestes. Estes são conceitos
relacionados com o cálculo astronómico, particularmente da posição dos astros. Os dados
obtidos são vários e de vários tipos tais como: Ascensão Reta, ângulo horário em
Greenwich, declinação, ângulo sideral, hora da passagem meridiana, horas de nascimento e
ocasos de astros, horas de crepúsculos, fracção iluminada do disco da Lua, alturas e
azimutes para diferentes posições geográficas, equação de tempo, paralaxe horizontal, semidiâmetro,
entre outros.
Estes conceitos e algoritmos foram postos em prática, criando a dita ferramenta
informática que foi, posteriormente, testada em comparação com ferramentas de referência
já existentes. Os resultados obtidos foram discutidos comprovando a eficácia dos ditos
algoritmos para aplicação no contexto da navegação astronómica.
The present dissertation addresses the theoretical concepts and algorithms necessary for the development of a routine for obtaining celestial coordinates. These are concepts related to astronomical calculation specifically of the positions of celestial bodies. The obtained data are numerous and of several kinds such as: Right Ascension, Greenwich Hour Angle, declination, sidereal angle, meridian passage time, rise and sunset times, twilight hours, illuminated fraction of the Moon's disk, heights and azimuths for different geographical positions, time equation, horizontal parallax, semi-diameter, among others. The concepts and algorithms were put into practice, creating a computer tool that was subsequently tested against existing reference tools. The results obtained were discussed proving the effectiveness of the mentioned algorithms for application in the context of astronomical navigation.
The present dissertation addresses the theoretical concepts and algorithms necessary for the development of a routine for obtaining celestial coordinates. These are concepts related to astronomical calculation specifically of the positions of celestial bodies. The obtained data are numerous and of several kinds such as: Right Ascension, Greenwich Hour Angle, declination, sidereal angle, meridian passage time, rise and sunset times, twilight hours, illuminated fraction of the Moon's disk, heights and azimuths for different geographical positions, time equation, horizontal parallax, semi-diameter, among others. The concepts and algorithms were put into practice, creating a computer tool that was subsequently tested against existing reference tools. The results obtained were discussed proving the effectiveness of the mentioned algorithms for application in the context of astronomical navigation.
Description
Keywords
Navegação Astronómica Coordenadas Celestes Almanaque Náutico AstroNavTH2020