Equinoctial tides.
At the equinoces, Spring tides have a greater range, and Neap tides a smaller range than at the solstices. But why?
My misconceptions so far...
1) The moon orbits in the plane of the equator and so it can be more directly in line with the sun when the plane of the equator intersects the sun.
FALSE : The moon orbits(almost) in the plane of the ecliptic.
2) The moon's small deviation from the plane of the ecliptic could have an effect if it was 'tipped' in the same orientation as the equator.
FALSE: The ascending node completes a full circle in 18.6 years.
3) The oblateness of the Earth means that the solar/lunar gravitational difference from one side to the other is greater when they're pulling across the equatorial distance than when pulling at an angle to it, i.e. a shorter distance.
: A google search doesn't show much linking oblateness to the tides, so I suspect I'm wrong on this.
Anyone like to explain it to me? Thanks.
At the equinoces, Spring tides have a greater range, and Neap tides a smaller range than at the solstices. But why?
My misconceptions so far...
1) The moon orbits in the plane of the equator and so it can be more directly in line with the sun when the plane of the equator intersects the sun.
FALSE : The moon orbits(almost) in the plane of the ecliptic.
2) The moon's small deviation from the plane of the ecliptic could have an effect if it was 'tipped' in the same orientation as the equator.
FALSE: The ascending node completes a full circle in 18.6 years.
3) The oblateness of the Earth means that the solar/lunar gravitational difference from one side to the other is greater when they're pulling across the equatorial distance than when pulling at an angle to it, i.e. a shorter distance.
: A google search doesn't show much linking oblateness to the tides, so I suspect I'm wrong on this.
Anyone like to explain it to me? Thanks.
via International Skeptics Forum http://ift.tt/2dMdZGa
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