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sidereon

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Satellite toolkit for Elixir with SGP4 propagation, coordinate transforms, GNSS positioning, orbit determination, conjunction assessment, pass prediction, and a Rust NIF backend.

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sidereon lib sidereon forces j2.ex
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lib/sidereon/forces/j2.ex 

defmodule Sidereon.Forces.J2 do

  @moduledoc """

  Earth's oblateness (J2) perturbation force model.

  """



  alias Sidereon.NIF



  @doc """

  Compute the acceleration due to J2 perturbation in ECI.

  Ref: Vallado (4th ed), Eq 8-30.

  """

  @spec acceleration({float(), float(), float()}, {float(), float(), float()}) ::

          {float(), float(), float()}

  def acceleration({_x, _y, _z} = position, {_vx, _vy, _vz} = velocity),

    do: NIF.force_j2_acceleration(position, velocity)

end