Below is a gif that might help.
Notice that the red dot makes one complete rotation around the axis (green dot) of the moon during a complete orbit of earth.
http://h1.ripway.com/cluelusshusbund/Moon/MoonEarthOneRotation.gif
https://www.physicsforums.com/showpost.php?p=145092&postcount=14
"Diuranl Libration is due the fact that over the course of time from moonrise to moonset we see the Moon from different angles as the Earth rotates. Thus allows us to see about 2% more of the Moon."
Hi Janus
How did you...
Hi tt, thanks for your reply.
I had read that page before but moved on since I wasn't sure if they were comparing apples to apples with the "degrees" they were talking about, but assuming the degrees they give ( 7.7, 6.5, 1 and 1.5) are the totals that the different types of Libration allows...
I understand that Libration allows us to see a total of about 9% of the far side of the moon, but what are the individual percentages of the far side of the moon that longitude, latitude, Diurnal and physical Libration allows us to see?
I can't seem to "Google-up" these individual...
I know the total is about 9%, but what are the individual percentages of the moon that longitude, latitude, Diurnal and physical Libration allows us to see?
Ok that explains why there aren't any moons or planets rotating on two axes in the "real world", but what about this hypothetical situation:
A perfectly round solid body (in outer space) is caused to rotate (equally) on two perpendicular axes, and then all outside forces are instantly...
If it's possible for a moon or planet to rotate on two axes, it seems odd that none do, because all moons and planets have surly been "bumped" by large objects while they were forming and since they formed which would have given them more than one axis of rotation, no?
Uranus rotates on its side and its poles always point in the same direction...
http://www.ifa.hawaii.edu/~barnes/ast110_06/quizzes/disc02_fig01.png
...if it was moved close enough to the sun to become tidally locked, would it necessarily lose all of its current rotation by the time it...
Thanks for the correct information, I "get-it" now, and below is a "png" of what you described.
http://www.ifa.hawaii.edu/~barnes/ast110_06/quizzes/disc02_fig01.png
Uranus is said to rotate on its side relative to the sun, and it also moves in such a way that both its poles (north an south) take turns facing the sun during its orbit, so does Uranus rotate on two separate poles?
After readin you'r earlier reply i went bak to a diferent groop an read the answr a guy named Janus gave (link below):::
http://www.sciforums.com/showpost.php?p=2162675&postcount=9
He describes in mor detale what you'r talkin about... an now id bet a small amount of money its the corect...
Hi Jeff... i appreciate you'r input also... wit som discusson this issue jus mite get figered out in my mind.!
An jus to be clear... my positon is not set in stone... i want to know what's really goin on wit the hammer.!
oK... to quickly identify our diference in percepton of...
That souns simular to what I've suspected... that not only does the hammer rotate CCW (10 to 12 times) over the length of its flight... it has also done a 180 degree "spiral" (the top of the hammer (ball) at release is now on the bottom when it lands)... which woud make the hammer apear to have...
Hammer Rotation Mystery.?
Hi...
Below is a link that shows a blond Russian lady Hammer thrower (ther are about 4 other people befor the video gets to the blond Russian lady) which includes slow motion video of when her hammer hits the ground.!
in the video of the Russian lady...