main.c File Reference

main.c - Simple demo program for Sun position using rectangular coordinates More...

Go to the source code of this file.

Macros
#define	SITE_LATITUDE_deg   -37.8236
	North lats +ve, south -ve (deg)
#define	SITE_LONGITUDE_deg   144.9913
	East lons +ve, west -ve (degrees)
#define	SITE_HEIGHT_m   30.0
	Height above sea level (metres)
#define	SITE_PRESSURE_hPa   1013.0
	Atmospheric pressure (hPa = mbar)
#define	SITE_TEMPERATURE_degC   15.0
	Temperature (degrees Celsius)
#define	SITE_TIMEZONE_h   10.0
	East zones +ve, west -ve (hours)

Functions
void	demo1 (void)
	Sample code demonstrating the calculation of the position of the Sun using rectangular coordinates. More...
void	demo2 (void)
	Sample code using the greatly simplified calculation of the position of the Sun using interpolated coordinates. More...
void	demo4 (void)
void	sunTopocentricFast (double j2kUtc_d, const Sky_DeltaTs *dTs, const Sky_SiteProp *site, Sky_SiteHorizon *topo)
	Uses previously calculated values of the Sun's apparent coordinates and interpolation to quickly calculate the Sun's topocentric position. More...
int	main (void)

Detailed Description

main.c - Simple demo program for Sun position using rectangular coordinates

Author

David Hoadley vcrum.nosp@m.ble@.nosp@m.westn.nosp@m.et.c.nosp@m.om.au

See the main page (or the end of this source file) for a description of this file.

Copyright

Copyright (c) 2020, David Hoadley vcrum.nosp@m.ble@.nosp@m.westn.nosp@m.et.c.nosp@m.om.au All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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Definition in file main.c.

Function Documentation

demo1()

void demo1

(

void

)

Sample code demonstrating the calculation of the position of the Sun using rectangular coordinates.

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Examples

demo1_sun.c.

Definition at line 131 of file main.c.

demo2()

void demo2

(

void

)

Sample code using the greatly simplified calculation of the position of the Sun using interpolated coordinates.

---

Examples

demo2_sun_tracking.c.

Definition at line 171 of file main.c.

sunTopocentricFast()

void sunTopocentricFast	(	double	j2kUtc_d,
		const Sky_DeltaTs *	dTs,
		const Sky_SiteProp *	site,
		Sky_SiteHorizon *	topo
	)

Uses previously calculated values of the Sun's apparent coordinates and interpolation to quickly calculate the Sun's topocentric position.

Parameters

[in]	j2kUtc_d	Days since Greenwich noon, 1-Jan-2000, UTC timescale
[in]	deltas	Delta T values, as set by the sky_initTime() (or sky_initTimeSimple() or sky_initTimeDetailed()) routines
[in]	site	Properties of the observing site, particularly its geometric location on the surface of the Earth, as set by the sky_setSiteLocation() function (or sky_setSiteLoc2())
[out]	topo	Topocentric position, in both rectangular (unit vector) form, and as Azimuth and Elevation (altitude) angles

When to call this function

This function is designed to be called at high frequency (more than once per second, even up to, say, 20 Hz).

Use this function when you have made a previous call to skyfast_init(). Depending on how long a period you want to track the sun using this routine, you may also need to run the function skyfast_backgroundUpdate() as a low frequency, low priority routine, to update the interpolation ranges. If you have not done this, call sun_nrelTopocentric() instead.

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Examples

demo2_sun_tracking.c.

Definition at line 82 of file main.c.