Galileo's observations of Neptune

  title={Galileo's observations of Neptune},
  author={Charles T. Kowal and Stillman Drake},
The planet Neptune was discovered in 1846. As its period of revolution is almost 165 years, Neptune has not yet completed one revolution since its discovery. Largely as a result of this, its orbit is not known with a precision comparable to that of the inner planets. A pre-discovery measurement of Neptune's position by Lalande in 1795 differs from the predicted position by 7 arc s. There is some debate about whether this discrepancy is real or an error of measurement1. Clearly, it would be… 
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2.11 – Giant Planets