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NEST BOXES & REFUGEES FOR WILD GARDEN ANIMALS
PRACTICAL ASTRONOMY WITH YOUR CALCULATOR OR SPREADSHEET
Duffet-Smith P.
Cuarta edición. Introduce rutinas para facilitar algunos de los problemas más frecuentes en astronomía. En un sencillo nivel matemático trata los siguientes temas: tiempo, sistemas de coordenadas, el Sol, los planetas, estrellas binarias, la Luna y los eclipses.
