If you are wondering where the big thread ‘Meet the new Kepler’ on Semi’s paper has gone it’s here. You can always get to it or any other post by going to the ‘Archives’ on the right of the page. Detailed discussion of planetary motion is now continuing here.
It’s difficult to get a handle on the ways forces acting on and in the solar system are orientated. This thread will raise more questions than answers about the origin and magnitude of the forces, but it might help with the orientation issues. The solar system is apparently orbiting the Milky Way galaxy at around 224km/s.
On the larger scale, as well as the movement shown in this graphic, Dr Leif Svalgaard informs me that according to his way of measuring velocity and distance, there is a motion of 627km/s of the galaxy “towards the centre of the local group”.
Additionally, there is the motion of the of the Local Interstellar Cloud, which is depicted here as moving in the direction of the south celestial pole. Dayton Miller in the 1920′s, confirmed by Yu. Galaev in 2002, concluded that the Earth was drifting at a speed of 208 km/sec. towards an apex in the Southern Celestial Hemisphere, towards Dorado, the swordfish, right ascension 4 hrs 54 min., declination of -70° 33′, in the middle of the Great Magellanic Cloud and 7° from the southern pole of the ecliptic. It seems possible therefore, that the solar system is headed in a similar direction to the LIC, in addition to it’s orbital motion wrt the galaxy. However, it is also thought that the solar system will soon be leaving the LIC and heading into a colder cloud. Perhaps someone here can clarify which direction we are heading out of the Local Cloud in.
The planets orbit the sun at approximately 45 degrees wrt the direction of the solar system’s galactic orbital motion, as evidenced by the angle the band of the milky way makes in the night sky, remembering the Earth is inclined a further 23.5 degrees to the invariant plane (the average of the planetary orbital planes). It is thought that this tilt is necessary in order to maintain the conservation of angular momentum as the solar system moves in it’s orbital path round the galaxy.
Within the solar system, the Sun has it’s ‘head back’. That is, the Solar polar axis is tilted at around seven degrees to the invariant plane, with the north solar pole tilted away from the direction of the solar system’s motion around, and slightly towards the galactic centre. At the moment, Jupiter Uranus and Neptune are below the solar equatorial plane and ‘leading’ the sun in the direction of the nose of the heliosphere, and Saturn is opposite, above the solar equatorial plane, and trailing ‘behind’ the Sun,
Vukevic has prepared this graphic which represents the orientation of the newly discovered ‘ribbon’ on the outer edge of the heliosphere, compared to the heliospheric current sheet (HCS) as depicted by Caltec, and has some ideas about it’s cause he’d like to discuss in a reasonable environment.
Have at it Vuk!