In what year did the close approach of Mars, known as a great opposition, occur, allowing for detailed observation?

Answer

1877

The text specifies that the rare treat for astronomers, the close approach of Mars known as a great opposition, occurred in the year 1877.

In what year did the close approach of Mars, known as a great opposition, occur, allowing for detailed observation?
HistoryMarsAstronomerobservationCanal