"Donal" wrote in message
...

"Thom Stewart" wrote in message
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Marty,

Right you are! Tell Donal to mark you up for One Point.

The Tides use the Moon Calender:^)
That is also the reason that Tide rides are possible.

I'm afraid that I can only award Marty 0.75 of a point.

I'm about to dissappear for a couple of days, so I'll explain when I get
back.

[hint] The sun has a much greater gravitational effect on the Earth than
the moon. So why does the moon seem to have a greater impact on the tides?

The tides are not created by what is normally called the "Gravitational Force."
(Of course, the tides are caused by gravitational forces, but they are not
calculated the same way as the "inverse square" rule that is used for
calculating orbits.)

I leave the rest as an exercise for the reader.