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cxx/mcc_mount_astro_erfa.h

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+#pragma once
+
+/*  MOUNT CONTROL COMPONENTS LIBRARY  */
+
+
+/*  ASTROMETRY ENGINE BASED ON ERFA-LIBRARY  */
+
+#include <chrono>
+// #include <cmath>
+
+
+#include "mcc_astrom_iers.h"
+#include "mcc_mount_coord.h"
+
+namespace mcc::astrom::erfa
+{
+
+#include <erfa.h>
+#include <erfam.h>
+
+class MccMountAstromEngineERFA
+{
+public:
+    typedef int engine_err_t;
+
+    // meteo parameters (to compute refraction)
+    struct meteo_t {
+        typedef double temp_t;
+        typedef double humid_t;
+        typedef double press_t;
+
+        temp_t temperature;  // Temperature in C
+        humid_t humidity;    // humidity in % ([0.0, 1.0])
+        press_t pressure;    // atmospheric presure in hPa=mB
+    };
+
+    struct engine_state_t {
+        meteo_t meteo{.temperature = 0.0, .humidity = 0.5, .pressure = 1010.0};
+
+        double wavelength = 0.55;  // observed wavelength in mkm
+
+        MccAngleLAT lat = "00:00:00"_dms;  // site latitude
+        MccAngleLON lon = "00:00:00"_dms;  // site longitude
+
+        mcc::astrom::iers::MccLeapSeconds _leapSeconds{};
+        mcc::astrom::iers::MccIersBulletinA _bulletinA{};
+    };
+
+    typedef std::chrono::system_clock::time_point time_point_t;
+
+    struct juldate_t {
+        static constexpr double MJD0 = ERFA_DJM0;
+        double mjd{51544.5};  // J2000.0
+    };
+
+    typedef MccAngle coord_t;
+    typedef MccAngle gst_t;
+    typedef MccAngle pa_t;
+    typedef double eo_t;
+
+    struct refract_result_t {
+        double refa, refb;
+    };
+
+protected:
+    engine_state_t _currentState;
+};
+
+}  // namespace mcc::astrom::erfa