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Das Astrolabium
Qual é o nome do principal instrumento usado pelos astrônomos para estudar as estrelas? - Blog espacial
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Sextant (astronomy) - Wikipedia
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T´OPICOS DE ASTRONOMIA ESTELAR OBSERVACIONAL
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Oktant (mätinstrument) – Wikipedia
Sextant (astronomy) - Wikipedia
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Astronomical Instruments | Astronomy At Edward Worth Library
Das Astrolabium
