Discussion Overview
The discussion revolves around the perihelion precession of Jupiter, comparing it to other celestial bodies such as Earth, Venus, Mars, and the Moon. Participants explore the timeframes associated with these precessions and the complexities involved in their calculations.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant states that the perihelion precession of Jupiter takes about 200,000 years.
- Another participant calculates the perihelion precession of Jupiter to be approximately 180,000 years based on NASA's orbital elements data.
- There is a correction regarding the perihelion precession of Earth, with one participant initially stating it takes about 100,000 years but later questioning this figure, suggesting it might be closer to 23,000 years.
- Another participant clarifies that the correct figure for Earth's perihelion precession is about 112,000 years, noting that 23,000 years pertains to the precession of the equinoxes.
- Questions are raised about the perihelion precession of Venus and Mars, as well as the perigee precession of satellites, with one participant suggesting the Moon's perigee precession is about 1 year.
- A participant provides a link to a resource that lists precession rates for all planets and mentions that the Moon's perigee precession is slightly less than 9 years.
- Another participant introduces the concept of orbit precession, referencing a study by J. Laskar and providing a detailed list of eccentricity and inclination cycle periods for various celestial bodies, including Jupiter.
- It is noted that Jupiter's perihelion precesses forward with a period of about 305,000 years, with additional oscillations involved.
- A participant inquires about the perihelion precession of Mercury, expressing confusion about the calculations based on the provided link.
Areas of Agreement / Disagreement
Participants express differing views on the timeframes for perihelion precession, particularly for Earth and Jupiter, with no consensus reached on the exact durations. The discussion includes multiple competing views and calculations.
Contextual Notes
Some claims rely on specific definitions and data sources, and there are unresolved mathematical steps regarding the calculations of precession periods.