diff options
-rw-r--r-- | navit/Makefile.am | 2 | ||||
-rw-r--r-- | navit/attr_def.h | 2 | ||||
-rw-r--r-- | navit/layout.c | 8 | ||||
-rw-r--r-- | navit/layout.h | 2 | ||||
-rw-r--r-- | navit/navit.c | 113 | ||||
-rw-r--r-- | navit/navit.h | 2 | ||||
-rw-r--r-- | navit/navit_shipped.xml | 4 | ||||
-rw-r--r-- | navit/sunriset.c | 309 | ||||
-rw-r--r-- | navit/sunriset.h | 115 |
9 files changed, 552 insertions, 5 deletions
diff --git a/navit/Makefile.am b/navit/Makefile.am index 1797d2783..56ae0eb98 100644 --- a/navit/Makefile.am +++ b/navit/Makefile.am @@ -41,7 +41,7 @@ libnavit_la_SOURCES = announcement.c atom.c attr.c cache.c callback.c command.c map_data.h mapset.h maptype.h menu.h messages.h navigation.h navit.h osd.h \ param.h phrase.h plugin.h point.h plugin_def.h projection.h popup.h route.h profile.h roadprofile.h search.h speech.h start_real.h \ transform.h track.h util.h vehicle.h vehicleprofile.h window.h xmlconfig.h zipfile.h \ - navit_nls.h + navit_nls.h sunriset.c sunriset.h comma=, XSLTS=@XSLTS@ diff --git a/navit/attr_def.h b/navit/attr_def.h index 20f3322ef..77ca1d703 100644 --- a/navit/attr_def.h +++ b/navit/attr_def.h @@ -259,6 +259,8 @@ ATTR(street_name_match) ATTR(language) ATTR(subtype) ATTR(filter) +ATTR(daylayout) +ATTR(nightlayout) ATTR2(0x0003ffff,type_string_end) ATTR2(0x00040000,type_special_begin) ATTR(order) diff --git a/navit/layout.c b/navit/layout.c index 230fa354a..332a9f526 100644 --- a/navit/layout.c +++ b/navit/layout.c @@ -30,7 +30,7 @@ struct layout * layout_new(struct attr *parent, struct attr **attrs) { struct layout *l; struct color def_color = {0xffff, 0xefef, 0xb7b7, 0xffff}; - struct attr *name_attr,*color_attr,*order_delta_attr,*font_attr; + struct attr *name_attr,*color_attr,*order_delta_attr,*font_attr,*day_attr,*night_attr; if (! (name_attr=attr_search(attrs, NULL, attr_name))) return NULL; @@ -39,6 +39,12 @@ struct layout * layout_new(struct attr *parent, struct attr **attrs) if ((font_attr=attr_search(attrs, NULL, attr_font))) { l->font = g_strdup(font_attr->u.str); } + if ((day_attr=attr_search(attrs, NULL, attr_daylayout))) { + l->dayname = g_strdup(day_attr->u.str); + } + if ((night_attr=attr_search(attrs, NULL, attr_nightlayout))) { + l->nightname = g_strdup(night_attr->u.str); + } if ((color_attr=attr_search(attrs, NULL, attr_color))) l->color = *color_attr->u.color; else diff --git a/navit/layout.h b/navit/layout.h index 1b2f1c09d..ef5fd1062 100644 --- a/navit/layout.h +++ b/navit/layout.h @@ -71,7 +71,7 @@ struct cursor { int interval; }; -struct layout { char *name; char *font; struct color color; GList *layers; GList *cursors; int order_delta; }; +struct layout { char *name; char* dayname; char* nightname; char *font; struct color color; GList *layers; GList *cursors; int order_delta; }; /* prototypes */ struct layout *layout_new(struct attr *parent, struct attr **attrs); diff --git a/navit/navit.c b/navit/navit.c index 89ae60478..03c8059c6 100644 --- a/navit/navit.c +++ b/navit/navit.c @@ -60,6 +60,7 @@ #include "util.h" #include "messages.h" #include "vehicleprofile.h" +#include "sunriset.h" /** * @defgroup navit the navit core instance. navit is the object containing nearly everything: A set of maps, one or more vehicle, a graphics object for rendering the map, a gui object for displaying the user interface, a route object, a navigation object and so on. Be warned that it is theoretically possible to have more than one navit object @@ -134,6 +135,7 @@ struct navit { GList *vehicleprofiles; int pitch; int follow_cursor; + int prevTs; }; struct gui *main_loop_gui; @@ -660,6 +662,8 @@ navit_new(struct attr *parent, struct attr **attrs) center.x=co.x; center.y=co.y; center.pro = pro; + + this_->prevTs=0; transform_setup(this_->trans, ¢er, zoom, (this_->orientation != -1) ? this_->orientation : 0); for (;*attrs; attrs++) { @@ -2075,6 +2079,7 @@ navit_vehicle_update(struct navit *this_, struct navit_vehicle *nv) profile(0,"return 1\n"); return; } + navit_layout_switch(this_); if (this_->vehicle == nv && this_->tracking_flag) tracking=this_->tracking; if (tracking) { @@ -2252,6 +2257,114 @@ navit_get_displaylist(struct navit *this_) return this_->displaylist; } +void +navit_layout_switch(struct navit *n) +{ + + int currTs=0; + struct attr iso8601_attr,geo_attr,layout_attr; + double trise,tset,trise_actual; + struct layout *l; + + if (navit_get_attr(n,attr_layout,&layout_attr,NULL)!=1) { + return; //No layout - nothing to switch + } + l=layout_attr.u.layout; + + if (l->dayname || l->nightname) { + //Ok, we know that we have profile to switch + + //Check that we aren't calculating too fast + if (vehicle_get_attr(n->vehicle->vehicle, attr_position_time_iso8601,&iso8601_attr,NULL)==1) { + currTs=iso8601_to_secs(iso8601_attr.u.str); + } + if (currTs-(n->prevTs)<60) { + //We've have to wait a little + return; + } + + if (vehicle_get_attr(n->vehicle->vehicle, attr_position_coord_geo,&geo_attr,NULL)!=1) { + //No position - no sun + return; + } + if (vehicle_get_attr(n->vehicle->vehicle, attr_position_valid, &geo_attr,NULL) && geo_attr.u.num==attr_position_valid_invalid) { + return; //No valid fix yet + } + + //We calculate sunrise anyway, cause it is need both for day and for night + if (__sunriset__(currTs,geo_attr.u.coord_geo->lat,geo_attr.u.coord_geo->lng,35,1,&trise,&tset)!=0) { + //near the pole sun never rises/sets, so we should never switch profiles + n->prevTs=currTs; + return; + } + + trise_actual=trise; + + if (l->dayname) { + + if ((HOURS(trise)*60+MINUTES(trise)==(currTs%86400)/60) || + (n->prevTs==0 && ((HOURS(trise)*60+MINUTES(trise)<(currTs%86400)/60)))) { + //The sun is rising now! + if (strcmp(l->name,l->dayname)) { + navit_set_layout_by_name(n,l->dayname); + } + } + } + if (l->nightname) { + if (__sunriset__(currTs,geo_attr.u.coord_geo->lat,geo_attr.u.coord_geo->lng,-12,0,&trise,&tset)!=0) { + //near the pole sun never rises/sets, so we should never switch profiles + n->prevTs=currTs; + return; + } + + if (HOURS(tset)*60+MINUTES(tset)==((currTs%86400)/60) + || (n->prevTs==0 && (((HOURS(tset)*60+MINUTES(tset)<(currTs%86400)/60)) || + ((HOURS(trise_actual)*60+MINUTES(trise_actual)>(currTs%86400)/60))))) { + //Time to sleep + if (strcmp(l->name,l->nightname)) { + navit_set_layout_by_name(n,l->nightname); + } + } + } + + n->prevTs=currTs; + } +} + +int +navit_set_layout_by_name(struct navit *n,char *name) +{ + struct layout *l; + struct attr_iter iter; + struct attr layout_attr; + + iter.u.list=0x00; + + if (navit_get_attr(n,attr_layout,&layout_attr,&iter)!=1) { + return 0; //No layouts - nothing to do + } + if (iter.u.list==NULL) { + return 0; + } + + iter.u.list=g_list_first(iter.u.list); + + while(iter.u.list) { + l=(struct layout*)iter.u.list->data; + if (!strcmp(name,l->name)) { + layout_attr.u.layout=l; + layout_attr.type=attr_layout; + navit_set_attr(n,&layout_attr); + iter.u.list=g_list_first(iter.u.list); + return 1; + } + iter.u.list=g_list_next(iter.u.list); + } + + iter.u.list=g_list_first(iter.u.list); + return 0; +} + int navit_block(struct navit *this_, int block) { diff --git a/navit/navit.h b/navit/navit.h index 5f71c62c6..8745889f3 100644 --- a/navit/navit.h +++ b/navit/navit.h @@ -97,6 +97,8 @@ struct route *navit_get_route(struct navit *this_); struct navigation *navit_get_navigation(struct navit *this_); struct displaylist *navit_get_displaylist(struct navit *this_); int navit_block(struct navit *this_, int block); +void navit_layout_switch(struct navit *n); +int navit_set_layout_by_name(struct navit *n, char* name); void navit_destroy(struct navit *this_); /* end of prototypes */ #ifdef __cplusplus diff --git a/navit/navit_shipped.xml b/navit/navit_shipped.xml index efcf02b05..463f54e5b 100644 --- a/navit/navit_shipped.xml +++ b/navit/navit_shipped.xml @@ -340,7 +340,7 @@ <map type="garmin" enabled="yes" data="/path/to/img" debug="4"/> </mapset> - <layout name="Car" color="#ffefb7" font="Liberation Sans"> + <layout name="Car" nightlayout="Car-dark" color="#ffefb7" font="Liberation Sans"> <cursor w="26" h="26"> <itemgra> @@ -1945,7 +1945,7 @@ </layer> </layout> - <layout name="Car-dark" color="#011001"> + <layout name="Car-dark" daylayout="Car" color="#011001"> <cursor w="26" h="26"> <itemgra> diff --git a/navit/sunriset.c b/navit/sunriset.c new file mode 100644 index 000000000..ee6a37b31 --- /dev/null +++ b/navit/sunriset.c @@ -0,0 +1,309 @@ +/* + +SUNRISET.C - computes Sun rise/set times, start/end of twilight, and + the length of the day at any date and latitude + +Written as DAYLEN.C, 1989-08-16 + +Modified to SUNRISET.C, 1992-12-01 + +(c) Paul Schlyter, 1989, 1992 + +Released to the public domain by Paul Schlyter, December 1992 + +*/ + + +#include <stdio.h> +#include <math.h> +#include <time.h> + +#include "sunriset.h" + +/* The "workhorse" function for sun rise/set times */ + +int __sunriset__( time_t ts, double lon, double lat, + double altit, int upper_limb, double *trise, double *tset ) +/***************************************************************************/ +/* Note: year,month,date = calendar date, 1801-2099 only. */ +/* Eastern longitude positive, Western longitude negative */ +/* Northern latitude positive, Southern latitude negative */ +/* The longitude value IS critical in this function! */ +/* altit = the altitude which the Sun should cross */ +/* Set to -35/60 degrees for rise/set, -6 degrees */ +/* for civil, -12 degrees for nautical and -18 */ +/* degrees for astronomical twilight. */ +/* upper_limb: non-zero -> upper limb, zero -> center */ +/* Set to non-zero (e.g. 1) when computing rise/set */ +/* times, and to zero when computing start/end of */ +/* twilight. */ +/* *rise = where to store the rise time */ +/* *set = where to store the set time */ +/* Both times are relative to the specified altitude, */ +/* and thus this function can be used to comupte */ +/* various twilight times, as well as rise/set times */ +/* Return value: 0 = sun rises/sets this day, times stored at */ +/* *trise and *tset. */ +/* +1 = sun above the specified "horizon" 24 hours. */ +/* *trise set to time when the sun is at south, */ +/* minus 12 hours while *tset is set to the south */ +/* time plus 12 hours. "Day" length = 24 hours */ +/* -1 = sun is below the specified "horizon" 24 hours */ +/* "Day" length = 0 hours, *trise and *tset are */ +/* both set to the time when the sun is at south. */ +/* */ +/**********************************************************************/ +{ + int year, month, day; + struct tm ymd; + double d, /* Days since 2000 Jan 0.0 (negative before) */ + sr, /* Solar distance, astronomical units */ + sRA, /* Sun's Right Ascension */ + sdec, /* Sun's declination */ + sradius, /* Sun's apparent radius */ + t, /* Diurnal arc */ + tsouth, /* Time when Sun is at south */ + sidtime; /* Local sidereal time */ + + int rc = 0; /* Return cde from function - usually 0 */ + + //Split ts to y/m/d + gmtime_r(&ts,&ymd); + year=ymd.tm_year+1900; + month=ymd.tm_mon+1; + day=ymd.tm_mday+1; + + /* Compute d of 12h local mean solar time */ + d = days_since_2000_Jan_0(year,month,day) + 0.5 - lon/360.0; + + /* Compute local sideral time of this moment */ + sidtime = revolution( GMST0(d) + 180.0 + lon ); + + /* Compute Sun's RA + Decl at this moment */ + sun_RA_dec( d, &sRA, &sdec, &sr ); + + /* Compute time when Sun is at south - in hours UT */ + tsouth = 12.0 - rev180(sidtime - sRA)/15.0; + + /* Compute the Sun's apparent radius, degrees */ + sradius = 0.2666 / sr; + + /* Do correction to upper limb, if necessary */ + if ( upper_limb ) + altit -= sradius; + + /* Compute the diurnal arc that the Sun traverses to reach */ + /* the specified altitide altit: */ + { + double cost; + cost = ( sind(altit) - sind(lat) * sind(sdec) ) / + ( cosd(lat) * cosd(sdec) ); + if ( cost >= 1.0 ) + rc = -1, t = 0.0; /* Sun always below altit */ + else if ( cost <= -1.0 ) + rc = +1, t = 12.0; /* Sun always above altit */ + else + t = acosd(cost)/15.0; /* The diurnal arc, hours */ + } + + /* Store rise and set times - in hours UT */ + *trise = tsouth - t; + *tset = tsouth + t; + + return rc; +} /* __sunriset__ */ + + + +/* The "workhorse" function */ + + +double __daylen__( int year, int month, int day, double lon, double lat, + double altit, int upper_limb ) +/**********************************************************************/ +/* Note: year,month,date = calendar date, 1801-2099 only. */ +/* Eastern longitude positive, Western longitude negative */ +/* Northern latitude positive, Southern latitude negative */ +/* The longitude value is not critical. Set it to the correct */ +/* longitude if you're picky, otherwise set to to, say, 0.0 */ +/* The latitude however IS critical - be sure to get it correct */ +/* altit = the altitude which the Sun should cross */ +/* Set to -35/60 degrees for rise/set, -6 degrees */ +/* for civil, -12 degrees for nautical and -18 */ +/* degrees for astronomical twilight. */ +/* upper_limb: non-zero -> upper limb, zero -> center */ +/* Set to non-zero (e.g. 1) when computing day length */ +/* and to zero when computing day+twilight length. */ +/**********************************************************************/ +{ + double d, /* Days since 2000 Jan 0.0 (negative before) */ + obl_ecl, /* Obliquity (inclination) of Earth's axis */ + sr, /* Solar distance, astronomical units */ + slon, /* True solar longitude */ + sin_sdecl, /* Sine of Sun's declination */ + cos_sdecl, /* Cosine of Sun's declination */ + sradius, /* Sun's apparent radius */ + t; /* Diurnal arc */ + + /* Compute d of 12h local mean solar time */ + d = days_since_2000_Jan_0(year,month,day) + 0.5 - lon/360.0; + + /* Compute obliquity of ecliptic (inclination of Earth's axis) */ + obl_ecl = 23.4393 - 3.563E-7 * d; + + /* Compute Sun's position */ + sunpos( d, &slon, &sr ); + + /* Compute sine and cosine of Sun's declination */ + sin_sdecl = sind(obl_ecl) * sind(slon); + cos_sdecl = sqrt( 1.0 - sin_sdecl * sin_sdecl ); + + /* Compute the Sun's apparent radius, degrees */ + sradius = 0.2666 / sr; + + /* Do correction to upper limb, if necessary */ + if ( upper_limb ) + altit -= sradius; + + /* Compute the diurnal arc that the Sun traverses to reach */ + /* the specified altitide altit: */ + { + double cost; + cost = ( sind(altit) - sind(lat) * sin_sdecl ) / + ( cosd(lat) * cos_sdecl ); + if ( cost >= 1.0 ) + t = 0.0; /* Sun always below altit */ + else if ( cost <= -1.0 ) + t = 24.0; /* Sun always above altit */ + else t = (2.0/15.0) * acosd(cost); /* The diurnal arc, hours */ + } + return t; +} /* __daylen__ */ + + +/* This function computes the Sun's position at any instant */ + +void sunpos( double d, double *lon, double *r ) +/******************************************************/ +/* Computes the Sun's ecliptic longitude and distance */ +/* at an instant given in d, number of days since */ +/* 2000 Jan 0.0. The Sun's ecliptic latitude is not */ +/* computed, since it's always very near 0. */ +/******************************************************/ +{ + double M, /* Mean anomaly of the Sun */ + w, /* Mean longitude of perihelion */ + /* Note: Sun's mean longitude = M + w */ + e, /* Eccentricity of Earth's orbit */ + E, /* Eccentric anomaly */ + x, y, /* x, y coordinates in orbit */ + v; /* True anomaly */ + + /* Compute mean elements */ + M = revolution( 356.0470 + 0.9856002585 * d ); + w = 282.9404 + 4.70935E-5 * d; + e = 0.016709 - 1.151E-9 * d; + + /* Compute true longitude and radius vector */ + E = M + e * RADEG * sind(M) * ( 1.0 + e * cosd(M) ); + x = cosd(E) - e; + y = sqrt( 1.0 - e*e ) * sind(E); + *r = sqrt( x*x + y*y ); /* Solar distance */ + v = atan2d( y, x ); /* True anomaly */ + *lon = v + w; /* True solar longitude */ + if ( *lon >= 360.0 ) + *lon -= 360.0; /* Make it 0..360 degrees */ +} + +void sun_RA_dec( double d, double *RA, double *dec, double *r ) +{ + double lon, obl_ecl; + double xs, ys, zs; + double xe, ye, ze; + + /* Compute Sun's ecliptical coordinates */ + sunpos( d, &lon, r ); + + /* Compute ecliptic rectangular coordinates */ + xs = *r * cosd(lon); + ys = *r * sind(lon); + zs = 0; /* because the Sun is always in the ecliptic plane! */ + + /* Compute obliquity of ecliptic (inclination of Earth's axis) */ + obl_ecl = 23.4393 - 3.563E-7 * d; + + /* Convert to equatorial rectangular coordinates - x is unchanged */ + xe = xs; + ye = ys * cosd(obl_ecl); + ze = ys * sind(obl_ecl); + + /* Convert to spherical coordinates */ + *RA = atan2d( ye, xe ); + *dec = atan2d( ze, sqrt(xe*xe + ye*ye) ); + +} /* sun_RA_dec */ + + +/******************************************************************/ +/* This function reduces any angle to within the first revolution */ +/* by subtracting or adding even multiples of 360.0 until the */ +/* result is >= 0.0 and < 360.0 */ +/******************************************************************/ + +#define INV360 ( 1.0 / 360.0 ) + +double revolution( double x ) +/*****************************************/ +/* Reduce angle to within 0..360 degrees */ +/*****************************************/ +{ + return( x - 360.0 * floor( x * INV360 ) ); +} /* revolution */ + +double rev180( double x ) +/*********************************************/ +/* Reduce angle to within -180..+180 degrees */ +/*********************************************/ +{ + return( x - 360.0 * floor( x * INV360 + 0.5 ) ); +} /* revolution */ + + +/*******************************************************************/ +/* This function computes GMST0, the Greenwhich Mean Sidereal Time */ +/* at 0h UT (i.e. the sidereal time at the Greenwhich meridian at */ +/* 0h UT). GMST is then the sidereal time at Greenwich at any */ +/* time of the day. I've generelized GMST0 as well, and define it */ +/* as: GMST0 = GMST - UT -- this allows GMST0 to be computed at */ +/* other times than 0h UT as well. While this sounds somewhat */ +/* contradictory, it is very practical: instead of computing */ +/* GMST like: */ +/* */ +/* GMST = (GMST0) + UT * (366.2422/365.2422) */ +/* */ +/* where (GMST0) is the GMST last time UT was 0 hours, one simply */ +/* computes: */ +/* */ +/* GMST = GMST0 + UT */ +/* */ +/* where GMST0 is the GMST "at 0h UT" but at the current moment! */ +/* Defined in this way, GMST0 will increase with about 4 min a */ +/* day. It also happens that GMST0 (in degrees, 1 hr = 15 degr) */ +/* is equal to the Sun's mean longitude plus/minus 180 degrees! */ +/* (if we neglect aberration, which amounts to 20 seconds of arc */ +/* or 1.33 seconds of time) */ +/* */ +/*******************************************************************/ + +double GMST0( double d ) +{ + double sidtim0; + /* Sidtime at 0h UT = L (Sun's mean longitude) + 180.0 degr */ + /* L = M + w, as defined in sunpos(). Since I'm too lazy to */ + /* add these numbers, I'll let the C compiler do it for me. */ + /* Any decent C compiler will add the constants at compile */ + /* time, imposing no runtime or code overhead. */ + sidtim0 = revolution( ( 180.0 + 356.0470 + 282.9404 ) + + ( 0.9856002585 + 4.70935E-5 ) * d ); + return sidtim0; +} /* GMST0 */ diff --git a/navit/sunriset.h b/navit/sunriset.h new file mode 100644 index 000000000..1ccad5797 --- /dev/null +++ b/navit/sunriset.h @@ -0,0 +1,115 @@ +extern const char* timezone_name; +extern long int timezone_offset; + +#define TMOD(x) ((x)<0?(x)+24:((x)>=24?(x)-24:(x))) +#define DAYSOFF(x) ((x)<0?"(-1) ":((x)>=24?"(+1) ":"")) + +#define HOURS(h) ((int)(floor(h))) +#define MINUTES(h) ((int)(60*(h-floor(h)))) + +#define ABS(x) ((x)<0?-(x):(x)) + +/* A macro to compute the number of days elapsed since 2000 Jan 0.0 */ +/* (which is equal to 1999 Dec 31, 0h UT) */ +/* Dan R sez: This is some pretty fucking high magic. */ +#define days_since_2000_Jan_0(y,m,d) \ + (367L*(y)-((7*((y)+(((m)+9)/12)))/4)+((275*(m))/9)+(d)-730530L) + +/* Some conversion factors between radians and degrees */ + +#ifndef PI + #define PI 3.1415926535897932384 +#endif + +#define RADEG ( 180.0 / PI ) +#define DEGRAD ( PI / 180.0 ) + +/* The trigonometric functions in degrees */ + +#define sind(x) sin((x)*DEGRAD) +#define cosd(x) cos((x)*DEGRAD) +#define tand(x) tan((x)*DEGRAD) + +#define atand(x) (RADEG*atan(x)) +#define asind(x) (RADEG*asin(x)) +#define acosd(x) (RADEG*acos(x)) +#define atan2d(y,x) (RADEG*atan2(y,x)) + +/* Following are some macros around the "workhorse" function __daylen__ */ +/* They mainly fill in the desired values for the reference altitude */ +/* below the horizon, and also selects whether this altitude should */ +/* refer to the Sun's center or its upper limb. */ + + +/* This macro computes the length of the day, from sunrise to sunset. */ +/* Sunrise/set is considered to occur when the Sun's upper limb is */ +/* 50 arc minutes below the horizon (this accounts for the refraction */ +/* of the Earth's atmosphere). */ +/* The original version of the program used the value of 35 arc mins, */ +/* which is the accepted value in Sweden. */ +#define day_length(year,month,day,lon,lat) \ + __daylen__( year, month, day, lon, lat, -50.0/60.0, 1 ) + +/* This macro computes the length of the day, including civil twilight. */ +/* Civil twilight starts/ends when the Sun's center is 6 degrees below */ +/* the horizon. */ +#define day_civil_twilight_length(year,month,day,lon,lat) \ + __daylen__( year, month, day, lon, lat, -6.0, 0 ) + +/* This macro computes the length of the day, incl. nautical twilight. */ +/* Nautical twilight starts/ends when the Sun's center is 12 degrees */ +/* below the horizon. */ +#define day_nautical_twilight_length(year,month,day,lon,lat) \ + __daylen__( year, month, day, lon, lat, -12.0, 0 ) + +/* This macro computes the length of the day, incl. astronomical twilight. */ +/* Astronomical twilight starts/ends when the Sun's center is 18 degrees */ +/* below the horizon. */ +#define day_astronomical_twilight_length(year,month,day,lon,lat) \ + __daylen__( year, month, day, lon, lat, -18.0, 0 ) + + +/* This macro computes times for sunrise/sunset. */ +/* Sunrise/set is considered to occur when the Sun's upper limb is */ +/* 35 arc minutes below the horizon (this accounts for the refraction */ +/* of the Earth's atmosphere). */ +#define sun_rise_set(year,month,day,lon,lat,rise,set) \ + __sunriset__( year, month, day, lon, lat, -35.0/60.0, 1, rise, set ) + +/* This macro computes the start and end times of civil twilight. */ +/* Civil twilight starts/ends when the Sun's center is 6 degrees below */ +/* the horizon. */ +#define civil_twilight(year,month,day,lon,lat,start,end) \ + __sunriset__( year, month, day, lon, lat, -6.0, 0, start, end ) + +/* This macro computes the start and end times of nautical twilight. */ +/* Nautical twilight starts/ends when the Sun's center is 12 degrees */ +/* below the horizon. */ +#define nautical_twilight(year,month,day,lon,lat,start,end) \ + __sunriset__( year, month, day, lon, lat, -12.0, 0, start, end ) + +/* This macro computes the start and end times of astronomical twilight. */ +/* Astronomical twilight starts/ends when the Sun's center is 18 degrees */ +/* below the horizon. */ +#define astronomical_twilight(year,month,day,lon,lat,start,end) \ + __sunriset__( year, month, day, lon, lat, -18.0, 0, start, end ) + + +/* Function prototypes */ + +double __daylen__( int year, int month, int day, double lon, double lat, + double altit, int upper_limb ); + +int __sunriset__( time_t ts, double lon, double lat, + double altit, int upper_limb, double *rise, double *set ); + +void sunpos( double d, double *lon, double *r ); + +void sun_RA_dec( double d, double *RA, double *dec, double *r ); + +double revolution( double x ); + +double rev180( double x ); + +double GMST0( double d ); + |