Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://zebu.uoregon.edu/disted/ph121/l4.html
Дата изменения: Thu Jan 6 20:44:27 2005 Дата индексирования: Tue Oct 2 02:33:43 2012 Кодировка: Поисковые слова: п п п п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п п р п п р п |
Orbital Properites of the Solar System
Overview of Solar System Orbits:
Moving Towards General Relativity
This is similar to the case of Mars, where Kepler used positional discrepancies to show that planetary orbits had to be elliptical in shape.
The resolution of the positional discrepancy of Mercury requires that space be "curved" in the vicinity of Mercury so that Mercury orbits inside this curvature. Such an orbit will differ slightly from an orbit in purely flat space.
Newton had implicitly assumed that space was flat.
General Theory of Relativity |
Space communicates with matter and instructs it how to move and, in turn, matter communicates with space and instructs it how to curve. |
Mercury orbits in Curved Space because it is a near a very large mass (the Sun).
The Visibility of the Planets:
Depends on the the planet-earth-sun angle. For the Outer Planets:
For the Inner Planets the situation is much different as they are always relatively near the Sun. There is a time in the orbit of Mercury and Venus called greatest elongation in which Venus appears at its maximum angular separation from the Sun. This is illustrated below. Note that since there are 15 degrees in one hour of time, then the angle of 46 degrees shown below corresponds to about 3 hours of time. When Venus is at the position in its orbit shown below, it will appear in the sky either 3 hours before or after sunrise. At any other position in its orbit, Venus will appear closer in time and angular separation to the sun.
For further experimentation please us Real Examples from the System Orbital Simulator