23 lines
1.2 KiB
Go
23 lines
1.2 KiB
Go
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// Package orbit propagates lightweight Sun-centered two-body conic orbits.
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//
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// Supported input styles:
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// - classical elliptic elements: A/E/I/Omega/W/M0 at EpochJD
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// - perihelion form: Q/E/I/Omega/W/TpJD for high-eccentricity, parabolic,
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// or hyperbolic comet-like trajectories
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//
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// All input angles are in degrees. EpochJD and TpJD are TT/TDB Julian days.
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// Returned geometric positions do not include perturbations beyond the supplied
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// elements. Astrometric results include down-leg light-time correction.
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// Apparent results follow this repository's existing planet semantics:
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// astrometric position plus nutation/of-date coordinate conversion, without a
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// full external aberration model. The package also provides observer-facing
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// altitude/azimuth/hour-angle and rise/transit/set helpers built on top of the
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// apparent topocentric coordinates. Rise/set helpers return package-local
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// sentinel errors ERR_ORBIT_NEVER_RISE / ERR_ORBIT_NEVER_SET, matching the
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// convention used by other public observation packages in this repository.
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//
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// In addition, the package includes a small classical visual-binary helper
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// based on the standard P/T/e/a/i/Omega/omega element set, returning apparent
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// position angle and separation on the sky.
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package orbit
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