Nomen

die Sonnenrotation

solar rotation

Die Sonnenrotation dauert etwa 27 Tage.

The solar rotation takes about 27 days.

Galilei studierte die Sonnenrotation.

Galileo studied the solar rotation.

to calculate/study the solar rotation One can observe the solar rotation through sunspots.

Erdrotation (Earth's rotation)

Composed of 'Sonne' (sun) + 'Rotation' (rotation). A straightforward compound.

The structure is simple: 'Sonne' (sun) plus the cognate 'Rotation'.

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