Ryan Malloy
3915d1784f
An existing product called PG Orbit (a mobile PostgreSQL client) creates a naming conflict. pg_orrery — a database orrery built from Keplerian parameters and SQL instead of brass gears. Build system: control file, Makefile, Dockerfile, docker init script. C source: GUC prefix, PG_FUNCTION_INFO_V1 symbol, header guards, ereport prefixes, comments across ~30 files including vendored SGP4. SQL: all 5 install/migration scripts, function name pg_orrery_ephemeris_info. Tests: 9 SQL suites, 8 expected outputs, standalone DE reader test. Documentation: CLAUDE.md, README.md, DESIGN.md, Starlight site infra, 36 MDX pages, OG renderer, logo SVG, docker-compose, agent threads. All 13 regression suites pass. Docs site builds (37 pages).
74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
/************************************************************************
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L1.2 Galilean satellite theory -- Lainey, Duriez & Vienne
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Clean-room implementation for pg_orrery.
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The L1.2 theory provides positions and velocities of Jupiter's four
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Galilean moons (Io, Europa, Ganymede, Callisto) relative to Jupiter's
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center, in the VSOP87 ecliptic J2000 reference frame.
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Reference:
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Lainey V., Duriez L., Vienne A.
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"New accurate ephemerides for the Galilean satellites of Jupiter"
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Astronomy & Astrophysics, 2004
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ftp://ftp.imcce.fr/pub/ephem/satel/galilean/L1/L1.2/
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The theory coefficients are astronomical constants derived from
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fitting observations of the Galilean system. They represent
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physical measurements and are not copyrightable.
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Copyright (c) 2026 Ryan Malloy <ryan@supported.systems>
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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Thread-safe: all functions are reentrant with no static mutable state.
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****************************************************************/
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#ifndef L12_H
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#define L12_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define L12_IO 0
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#define L12_EUROPA 1
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#define L12_GANYMEDE 2
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#define L12_CALLISTO 3
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/*
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* Compute the position (and optionally velocity) of a Galilean moon
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* using the L1.2 semi-analytic theory.
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*
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* jd: Julian date in Terrestrial Time (TT).
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* body: Moon index: 0=Io, 1=Europa, 2=Ganymede, 3=Callisto.
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* xyz: Output position in AU, VSOP87 ecliptic J2000 frame,
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* relative to Jupiter's center. Must point to double[3].
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* xyzdot: Output velocity in AU/day, same frame. May be NULL
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* to skip velocity computation.
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*/
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void GetL12Coor(double jd, int body, double *xyz, double *xyzdot);
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#ifdef __cplusplus
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}
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#endif
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#endif /* L12_H */
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