[LEAPSECS] props for talks?

[Rob Seaman]

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