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Orts

sun_direction_from_body

Defined in: ephemeris.rs:161

fn sun_direction_from_body(body: &str, epoch: &Epoch) -> [Vec3<frame::Gcrs>](../../structs/vec3/)

Sun direction (unit vector) as seen from a given central body, in J2000 equatorial frame.

  • "earth" / "moon": delegates to sun_direction_eci (Moon parallax < 0.15°, negligible)
  • Other known planets: computed from heliocentric orbital elements
  • Unknown bodies: fallback to +X direction (vernal equinox)

The returned vector points FROM the body TOWARD the Sun.