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I am writing a basic javascript orrery which will display the position of the planets orbiting the sun. Using keplers equation I am going to find the true anomaly and the radius at the current time and then plot the points to a 2d grid.

The problem is I need to know the time that has elapsed since perihelion so I can calculate the Mean anomaly. I plan to use the iterative Newton method to get the Eccentric Anaomaly and from that work out the true anomaly.

Do you guys know where I can find a list of previous perihelion dates where the planets were at their closest approach?

Thanks

Alex

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# Perihelion Pass Dates?

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