Hi Richard,
> As part of the intro and foundations, when you bring up the pendulums be sure
> and start by taking your pulse.
I'll start with this:
http://svs.gsfc.nasa.gov/vis/a000000/a003800/a003894/moon_720p30.mp4
>From Dial-A-Moon:
http://svs.gsfc.nasa.gov/vis/a000000/a003800/a003894/
Whether planet or moon, the number of days in a year is one less than the
number of rotations:
http://cseligman.com/text/sky/rotationvsday.htm
> Also show a tuning fork. My first 'good' watch was a Bulova Accutron.
As your suggestions imply, SI rather derives from a frequency standard:
http://en.wikipedia.org/wiki/File:Relations_between_new_SI_units_definitions.png
Rob
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