Post by 1dave on Nov 23, 2020 0:01:23 GMT -7
With the sun setting far to the south, have you noticed how far NORTH the moon is setting?
Quandam upon an astronomical duration the moon rotated, but now it just wobbles back and forth.
www.youtube.com/watch?v=vC7odtQHoPc
www.space.com/18593-a-year-of-lunar-phases-and-wobbles-video.html
www.youtube.com/watch?v=vC7odtQHoPc
www.space.com/18593-a-year-of-lunar-phases-and-wobbles-video.html
Investigators (I've given up on the word "scientist") are now pretty sure another planet hit the earth early in it's history, and the lighter outer crusts of each coalesced to form our moon.
This tilted earth's axis giving us our seasons, and giving widely different orbital planes to all involved.
As Mercury lost most of it's surface in a collision early in it's history, for my money, IT is the rest of the story, although many investigators believe the other belligerent was destroyed in the crash.
When?
Well the moon is about 384,405 km away and moving further at about 1.5 inches per year,
so 384,405 km/1.5" =
Some data:
Earth Mean Density (g cm-3) = 5.515 - Moon Mean Density = 3.344
The moon is 27% as big as the earth but only 1.2% as massive.
As the moon moves away, angular momentum has caused the earth's rotation to slow down.
The secular increase in length of days is ~ 0.002 seconds per century, but that adds up.
Studies of diurnal and tide related growth rings in fossil corals show that 365 million years ago (mid Devonian times) days were 21.9 hours long and there were 400 days in a year.
This tilted earth's axis giving us our seasons, and giving widely different orbital planes to all involved.
As Mercury lost most of it's surface in a collision early in it's history, for my money, IT is the rest of the story, although many investigators believe the other belligerent was destroyed in the crash.
When?
Well the moon is about 384,405 km away and moving further at about 1.5 inches per year,
so 384,405 km/1.5" =
Some data:
Earth Mean Density (g cm-3) = 5.515 - Moon Mean Density = 3.344
The moon is 27% as big as the earth but only 1.2% as massive.
As the moon moves away, angular momentum has caused the earth's rotation to slow down.
The secular increase in length of days is ~ 0.002 seconds per century, but that adds up.
Studies of diurnal and tide related growth rings in fossil corals show that 365 million years ago (mid Devonian times) days were 21.9 hours long and there were 400 days in a year.