Fast and stable solver for Kepler's equation in Python

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  • License: MIT License ( MIT License Copyright (c) 2020-2022 Dan Foreman-Mackey Permission is hereby granted, free of charge...)
  • Author: Dan Foreman-Mackey
  • Requires: Python >=3.7
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Project description

Fast and stable solver for Kepler's equation extracted from exoplanet.

Installation

The best way to install is using pip:

python -m pip install kepler.py

Usage

This package exposes two functions:

  • kepler: Solves Kepler's equation and returns the cosine and sine of the true anomaly:
import kepler
eccentric_anomaly, cos_true_anomaly, sin_true_anomaly = kepler.kepler(mean_anomaly, eccentricity)
  • solve: A lower-level interface that is used by kepler to actually do the solving (Note that this will return garbage for eccentricities out of the range zero to one):
import kepler
eccentric_anomaly = kepler.solve(mean_anomaly, eccentricity)

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  • License: MIT License ( MIT License Copyright (c) 2020-2022 Dan Foreman-Mackey Permission is hereby granted, free of charge...)
  • Author: Dan Foreman-Mackey
  • Requires: Python >=3.7
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