Actually there's a perfectly simple way to test it: you just look for cycles in earthquake data with the same periodicity as the moon's motion. There aren't any.
Well obviously, or else that would mean the moon was the main reason for Earthquakes if that was the case, which it's not, nor is that what I was saying, since there are many other reasons why Earthquakes occur. But that doesn't mean the effects of a certain formation of an eclipse could cause them from time to time, depending on the situation and other factors at play.
My point is that gravitational effects are not the sole cause of earthquakes.
Gravity is a vector quantity, in physics' simplest formulation, and the various gravitational influences on the earth can be added in the routine way vectors are added. The vectors change direction significantly as the earth and moon do their little dance around the sun, but they don't affect each other.
Agreed.... or at the very least, they don't affect one another to any noticable amount that we are currently aware of that would be of any importance.
Can't let that one go by. The sun affects the tides as well, but because the moon is so much closer than the sun, the sun's effect is only about a quarter that of the moon, if my memory is correct.
Which also makes sense, not just by what you just said, but our changing position from the sun yearly causes temp. changes which also would modify the usual tidal pattern.... not to mention our axis rotation.
There are, however, noticeably higher tides when the sun and moon are lined up on the same side of the earth, as they are during an eclipse, and noticeably smaller ones when they're on opposite sides. Tides also affect the whole planet, not just the water on it. The whole planet flexes a bit, the effect is just more obvious on the water because it's so much less rigid.
So with that said, when the sun and moon are lined up, which from what you said can cause higher then normal tides, that would mean more volume of water, which means more overall weight positioned in one location..... that in itself could cause certain effects on the tectonic plates, via changing pressure.
Seasons are not due to earth's changing distance from the sun, they're due to the earth's axial tilt and the changing angle of incidence of solar radiation at the surface, which is why the seasons are different in the northern and southern hemispheres.
agreed mostly, however our orbit isn't a perfect circle, and as we move away from the sun on one portion of our orbit, that is what affects our axis, which both work hand in hand:
^ As our orbit runs along the same pattern as always, so too does our axial tilt.... and which is also why, for example, Canada's Summer isn't as strong as Australias, as when we are tilted towards the sun, we're also farther away, compared to when they are tilted towards the sun, they are also much closer..... which makes us more of a grass plains then a dessert in the summer time (In our hotter areas)
Think of it as one of those old KFC Oopie balls you used to get back in the 80's, were the ball was weighted on one end.
Summer in Canada is Winter in Australia. And vice versa of course. Earth is actually closer to the sun during a northern hemisphere winter and farther away in the summer. The difference in both cases is about 25,000 km from the average distance, again if my memory is correct. I suppose I could look it up... It's not much of a difference really, less than .02%, not enough to matter.
I dunno about that....
Ever wondered why there isn't an eclipse every lunar month? Eclipses happen when the moon gets between the earth and the sun, and it does that about 13 times a year, so why don't we see 13 eclipses a year? See if you can figure that one out.
Well for one thing, the axis tilt... and as a second:
It too isn't a perfect circular orbit.