Hey(adsbygoogle = window.adsbygoogle || []).push({});

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

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Perihelion Pass Dates?

**Physics Forums | Science Articles, Homework Help, Discussion**