grodog
Junior Member
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Post by grodog on Feb 4, 2024 21:41:25 GMT
Do we have any tidal models based on Poseidon’s moons, Proteis and Nereus?
I thought we did, but some quick searching (in the 1e books) didn’t yield any data.
Allan.
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Post by Pawel on Feb 4, 2024 22:31:39 GMT
Do we have any tidal models based on Poseidon’s moons, Proteis and Nereus? I thought we did, but some quick searching (in the 1e books) didn’t yield any data. Allan. Hmm, it would be cool of we had some sort of calculator or tool! But i'm not sure if it's feasible... Quoting from the books: On Poseidon, with its two moons, the pattern is a lot more complex, and varies substantially depending on the relative orbits of its moons. There are official GEO tidal predictions available for most of the planet, but local geography can impact patterns dramatically, so forecasts for remote areas may not be accurate. In some places on Poseidon, tidal ranges are minor, only a few dozen centimeters. In others they can be extreme, more than a dozen meters during each tidal cycle. Such tides can have major impacts on shoreline settlements and marine navigation. |
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grodog
Junior Member
Posts: 32
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Post by grodog on Feb 4, 2024 23:42:41 GMT
Greyhawk has two moons, and ISTR some tidal models for it, but I don’t think the moons are likely to be of the same mass, or at the same distance from the primary.
I’ll see what I can dig up….
Allan.
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Post by Pawel on Feb 5, 2024 6:24:00 GMT
Greyhawk has two moons, and ISTR some tidal models for it, but I don’t think the moons are likely to be of the same mass, or at the same distance from the primary. I’ll see what I can dig up…. Allan. That would be awesome!! |
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Post by lupmet on Feb 5, 2024 13:29:38 GMT
Obvious addition to that Kickstarter that had been floated about developing various tools for Poseidon.
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grodog
Junior Member
Posts: 32
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Post by grodog on Feb 5, 2024 19:18:37 GMT
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Post by Pawel on Feb 5, 2024 19:20:41 GMT
Sweet mother of all that's scientific! That's a lot of maths on a Monday.  Many thanks, Allan! |
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grodog
Junior Member
Posts: 32
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Post by grodog on Feb 16, 2024 2:59:45 GMT
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Post by Pawel on Feb 16, 2024 8:29:23 GMT
Whoa!! Macros and everything! Very impressive. Great find! Thank you very much, Allan. |
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Post by neil on Feb 22, 2024 10:05:34 GMT
I did work out some incredibly naive numbers for tidal heights. That was using Newton's approach to equilibrium tidal heights, which doesn't apply to real planets. However, it's good enough to suggest that tides on Poseidon are about four or five times as large as on Earth. ( Spreadsheet of calculation) On Earth, that theory says the moon causes tides that go from +55cm to -55cm above mean sea level at the equator. The sun causes tides that go from +24cm to -24cm. On Poseidon, Proteus causes tides that go from +240cm to -240cm, Nereus causes tides that go from +27cm to -27cm, and LSerp from +22cm to -22cm. Tides on Poseidon are huge! Of course, actual tides are much more complex and there's less opportunity for some of the large tidal ranges you seen on coastal bits of Earth. |
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Post by Pawel on Feb 22, 2024 10:08:29 GMT
I did work out some incredibly naive numbers for tidal heights. That was using Newton's approach to equilibrium tidal heights, which doesn't apply to real planets. However, it's good enough to suggest that tides on Poseidon are about four or five times as large as on Earth. On Earth, that theory says the moon causes tides that go from +55cm to -55cm above mean sea level at the equator. The sun causes tides that go from +24cm to -24cm. On Poseidon, Proteus causes tides that go from +240cm to -240cm, Nereus causes tides that go from +27cm to -27cm, and LSerp from +22cm to -22cm. Tides on Poseidon are huge! Of course, actual tides are much more complex and there's less opportunity for some of the large tidal ranges you seen on coastal bits of Earth. Such awesome work, Neil! Thank you! |
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Post by neil on Feb 24, 2024 18:42:47 GMT
Sorry, I interpreted the results wrong. The ranges are from high tide to low tide, so lunar tides on Earth are expected to have a range of 55cm from highest to lowest level.
But the qualitative result is still true: tides on Poseidon are about four or five times higher than on Earth.
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Many thanks, Allan!
