Ryan Malloy
4d64b78fb8
Four new functions (184 → 188 SQL objects): - sun_almanac_events(): merged rise/set + twilight SRF (4 threshold scans) - planet_conjunctions(): angular separation minima via daily scan + ternary search - satellite_penumbral_fraction(): continuous 0.0-1.0 shadow depth - moon_physical_libration(): Meeus p. 373 Fourier corrections (tau, rho) 30 regression test suites, all passing.
25 lines
825 B
C
25 lines
825 B
C
/*
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* libration.h -- Lunar optical libration (Meeus Ch. 53)
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*
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* Three components of the Moon's apparent wobble:
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* l -- optical libration in longitude (degrees, [-8, +8])
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* b -- optical libration in latitude (degrees, [-7, +7])
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* p -- position angle of the Moon's axis (degrees)
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*/
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#ifndef PG_ORRERY_LIBRATION_H
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#define PG_ORRERY_LIBRATION_H
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typedef struct
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{
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double l; /* libration in longitude, degrees (optical + physical) */
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double b; /* libration in latitude, degrees (optical + physical) */
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double p; /* position angle of axis, degrees */
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double _tau; /* physical libration correction in longitude, degrees */
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double _rho; /* physical libration correction in latitude, degrees */
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} lunar_libration;
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void compute_lunar_libration(double jd, lunar_libration *lib);
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#endif /* PG_ORRERY_LIBRATION_H */
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