3 Planets converging on Leo Constellation

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    Converging Planets
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Discussion Overview

The discussion revolves around calculating the Right Ascension (RA) and Declination (Dec) of Venus, Mars, and Saturn as they converge in the Leo constellation. Participants explore the necessary data and methods for making these calculations, including considerations of planetary positions and corrections needed for accurate results.

Discussion Character

  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant expresses interest in calculating the RA and Dec of Venus, Mars, and Saturn based on specific astronomical parameters.
  • Another participant points out that RA and Dec data for planets can be accessed through the JPL website.
  • A different participant mentions the desire to calculate RA and Dec for future dates using a specific data file from JPL.
  • One participant highlights the complexity of the problem, noting the need to account for the Earth's position and convert to geocentric coordinates, while providing a resource for understanding the calculations involved.

Areas of Agreement / Disagreement

The discussion does not reach a consensus on the methods for calculating RA and Dec, as participants present various resources and acknowledge the complexity of the calculations involved.

Contextual Notes

Participants mention several assumptions and dependencies, such as the need for accurate data on planetary positions and the corrections required for geocentric coordinates, but do not resolve these complexities.

Philosophaie
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Venus, Mars and Saturn are converging on the Constellation Leo at the end of the month. I would like to find the Right Ascension and Declination of these planets given the obliquity, the true anomaly, the radius from the sun and the inclination.
 
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This is not a simple problem, since you not only need to calculate the position of the planets relative to the sun, but also calculate the position of the Earth, then convert everything into geocentric coordinates, correct for the equation of time, etc. However, here is a good website showing how to do it:

http://www.stargazing.net/kepler/ellipse.html
 

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