OT. Days getting longer.. ???

Since 1900, elevators have allowed cities to build high-rise buildings, which has slowed down earth's rotation too.

High-voltage transmission lines, too.

Satellite launches slow earth's rotation. And mining and oil wells.

But sinking ships speed it up.

Oh swell! So we can measure the rise in sea level by measuring the length of the day. Data, anyone?

Is that planet earth picture an AI product? With the sun in the background, we should have been looking at the night side. Not very I, this AI.

Jeroen Belleman

Various unrealistic online pictures, edited or fake, should be identified by law.

It is pretty much uniformly distributed over the Earth's surface.

It is real - inferred from VLBI data. It is sensitive enough to detect seasonal variations in the northern hemisphere summer (and has been for quite a while). The asymmetry of land masses north and south of the equator. When trees are in leaf in US Canada Russia forests the Earth's moment of inertia is increased by the weight of sap and leaves.

Effects of glaciers melting can go either way depending on what altitude the ice in the glacier was at (many glaciers are at high altitudes).

Thank you for these references. Interesting. I was momentarily confused by some of the French site's polar motion graphs labelled in 'as'. I gather those are arcseconds, not attoseconds. ;-)

I see that LOD is far more involved than the OP implied. Getting an undisputable sea level signal from LOD data is not going to be clear cut.

Everyone appears to be worrying about phenomena deeply buried in noise these days,

Jeroen Belleman