Janssen (lunar crater)

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Janssen is a very large impact crater in the southern part of the Moon 's front panel. Northeast of him running the Vallis Rheita. Its northern boundary is overlaid by the smaller, but clearly distinct crater Fabricius. Janssen itself is heavily eroded and overprinted by additional impacts. In relatively flat inside the moon groove system of Rimae Janssen runs.

The crater was officially named by the IAU in 1935 by the French astronomer Pierre Jules César Janssen.