start new 10-micron stellarium daemon

Daemons/10micron_stellarium/angles.h

@@ -0,0 +1,89 @@
+/*
+ * This file is part of the mountdaemon_10micron project.
+ * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <erfam.h>
+#include <weather_data.h>
+
+#define RADEC_STR_MAXLEN    72
+
+#define RAD2DEG(angle)  (angle * ERFA_DR2D)
+#define DEG2RAD(angle)  (angle * ERFA_DD2R)
+#define RAD2HRS(angle)  (angle * 24. / ERFA_DPI)
+#define HRS2RAD(hour)   (hour * ERFA_DPI / 24.)
+
+typedef struct{
+    double utc1; double utc2; // UTC JD, commonly used MJD = utc1+utc2-2400000.5
+    double MJD;
+    double tai1; double tai2; // TAI JD
+    double tt1;  double tt2;  //  TT JD
+} sMJD_t;
+
+// polar coordinates & equation of origins (all in radians)
+typedef struct{
+    double ha;  // hour angle
+    double dec; // declination
+    double ra;  // right ascension
+    double eo;  // equation of origins
+} polarCrds_t;
+
+// horizontal coordinates (all in radians)
+typedef struct{
+    double az; // azimuth, 0 @ south, positive clockwise
+    double zd; // zenith distance
+} horizCrds_t;
+
+// observational place coordinates and altitude; all coordinates are in radians!
+typedef struct{
+    double slong;   // longitude, radians
+    double slat;    // lattitude, radians
+    double salt;    // altitude, m
+} placeData_t;
+
+// DUT/polar almanach data
+// TODO: add function to read this data from almanach
+typedef struct{
+    double DUT1;    // UT1-UTC, sec
+    double px;      // polar coordinates, arcsec
+    double py;
+} almDut_t;
+
+char *radec2str(double ra, double dec, char buf[RADEC_STR_MAXLEN]);
+void norm_RA(double *ra);
+void norm_RADEC(double *ra, double *dec);
+void norm_angle180(double *a);
+
+void hor2eq(horizCrds_t *h, polarCrds_t *pc, double sidTime);
+void eq2horH(polarCrds_t *pc, horizCrds_t *h);
+void eq2hor(polarCrds_t *pc, horizCrds_t *h, double sidTime);
+
+void r2sHMS(double radians, char *hms, int len);
+void r2sDMS(double radians, char *hms, int len);
+void hor2eq(horizCrds_t *h, polarCrds_t *pc, double sidTime);
+void eq2horH(polarCrds_t *pc, horizCrds_t *h);
+void eq2hor(polarCrds_t *pc, horizCrds_t *h, double sidTime);
+bool get_MJDt(struct timeval *tval, sMJD_t *MJD);
+bool get_LST(sMJD_t *mjd, double dUT1, double slong, double *LST);
+bool get_ObsPlace(struct timeval *tval, polarCrds_t *p2000, polarCrds_t *pnow, horizCrds_t *hnow);
+
+bool setDUT(almDut_t *D);
+void getDUT(almDut_t *D);
+
+bool setPlaceData(double longitude, double latitude, double altitude);
+void getPlaceData(placeData_t *pd);