Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Naonobu is a small lunar impact crater that is located on the eastern Mare Fecunditatis, to the northwest of the prominent crater Langrenus. It forms a triple-crater formation with the adjacent Atwood to the south and Bilharz just to the southwest. Naonobu and Atwood are separated by only a few kilometres. The interior of this crater has been flooded with basaltic lava, leaving a relatively flat interior and a reduced outer rim. There is no central peak, but a tiny craterlet lies just to the southwest of the mid-point. A similar craterlet lies across the western interior of the rim. This crater was previously designated Langrenus B before being renamed by the IAU.

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