I think I just figured out something: when it's the 13th of the month and a Thursday in my part of the world, then its Friday on the other side (going west) of the International Dateline, so would that make the International Dateline an unlucky place to be? Its the 13th on one side, and Friday on the other. Since the International Dateline passes mainly through the ocean, this would affect mainly fish and whales, but only the ones who are superstitious and have calendars.
When I thought about the three dimensional aspects of the International DateLINE extending into the ocean depths, I realized it isn't really just a line, it's a PLANE surface that extends from the middle of the earth outward. So its really the International Dateplane. Then I envisioned the shape of the current dateline on a globe and realized that it isn't straight, so the International Dateplane"S" would really consist of multiple planes.
The fish would probably only spend brief periods of time passing through the date planes, so that would minimize their unluckiness. If they are caught in a fisherman's net though, its a really unlucky day for them.
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