Tides
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Bernard Nebel.
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For those unfamiliar with tides, the following time lapse video will be revealing. (To be sure, this is a location of exceptionally high tidal flux.)
Connecting tides with the moon
Relating tides to the moon can be achieved by relating the time of every other high tide (every other because of two tides per day) to the times of moon rise for the same days. Students will find that they both follow the same schedule occurring the same amount of time apart, and both shifting about 55 minutes later each day.
For a tidal schedule, type into your browser: Tidal schedule ______ (any desired location)
For a lunar schedule, type into your browser: time of moonrise ____ (same location)
How does the moon cause tides?
The gravitational pull of the moon straight forwardly explains the oceans bulging up toward the moon and the earth turning under the “bulge” causing one the tidal cycle per day. But there are two tidal cycles per day caused by a “bulge” of water on the side of the earth away from moon as well as the one facing the moon.
The explanation given in the text, that it is caused by centrifugal force of the earth-moon system can still be found on the internet, but mathematical calculations show it to be inadequate for what is observed. Therefore, more is involved. The following video gives the latest explanation:
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