The Appearances of Venus and Mars in 1610

@article{Peters1984TheAO,
  title={The Appearances of Venus and Mars in 1610},
  author={William T. Peters},
  journal={Journal for the History of Astronomy},
  year={1984},
  volume={15},
  pages={211 - 214}
}
As a contribution to the investigation of how Venus and Mars appeared to their first telescopic observers in the latter half of 1610, I calculated their positions and appearances for that time. I also observed Venus with a replica of one of Galileo's telescopes in January 1984, when the planet's appearance was similar to that of October 1610. In what follows I report on the results of these investigations. Venus can be seen in the daytime by an expert observer who knows just where to look, and… 

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