Questions regarding the action of or an object rotating along an axis.

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Determining planetary positions on the celestial sphere by Right Ascension and Declination

How would one go about determining the position of the different planets in our solar system with respect to the celestial sphere based on the following data set? Is there a practical way to calculate ...
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What is the direction of the dark energy force on gravitational rotation curve of galaxies?

Is the direction of this force is like gravity (to the center of mass) or orbiting objects' direction of movement?