December 20, 2008

From J.J. Gerritse:

Re: Distant moons may have liquid oceans (Dec. 10): Tidal waves are not “re­sult­ing from the mo­tions of moons with re­spect to their host plan­ets”, but from the axial rotation of the moon (and the planet itself). In fact, the tidal wave has a fixed position relative to the connecting line, and the planet rotates under it.

Otherwise, the tides on earth would have a monthly, rather than a daily period.

J.J. Gerritse
Mühlenstraße 11
D-47546 Kalkar-Wissel


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