Tidal Info Website-Thanks

Subject: Tidal Info Website-Thanks
From: Andrew Taylor <>
Date: Wed, 30 Jan 2002 00:41:55 +1100 (EST)
I'm not sure anyone has mentioned that, if you don't have a tide chart,
you can easily forecast tides for a number of days by assuming the tides
are 50 minutes later each day.

The reason is that moon rises on average 50.47 minutes later each day
due to its rotation around the earth.  However, the predictions in
tide charts should be more accurate because they allow for various
complicating factors.

I'm sure most birding-aus reader knew this.  But can you explain how
there can be two high tides a day in many places, including much of
Australia's coast?  Few people seem to know and incorrect explanations
are common, even in books.  [ If you want to know, do a web
search for barycenter + tide ]

Andrew Taylor

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