Solarlib

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Arduino solar position calculator

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Currently this library only compiles under the Teensy modified version
of Arduino provided by PJRC.com (https://www.pjrc.com/teensy/td_download.html), and relies on the modified Time library
that is packaged with the PJRC version of the Arduino software. See the PJRC 
forum for downloads: 
http://forum.pjrc.com/forums/6-Announcements

To install this library, place the folder containing all of the Solarlib
files into the `libraries` directory in your Arduino folder.

## Solarlib		Luke Miller December 2012
Released into the public domain (originally based on U.S. Govt. products)
No warranty given or implied.

A library of functions for Arduino to calculate aspects of solar position
in the sky using a time value, latitude, longitude, and time zone.
Output includes estimates of current sun elevation and azimuth (position in 
the sky), sunrise, solar noon, and sunset times for the current day, and 
various other statistics for the sun at the given time. Results should be
accurate for the years 1901 to 2099, for locations between +/- 72 latitude.
Calculations are based on spreadsheet and information found at:
http://www.esrl.noaa.gov/gmd/grad/solcalc/calcdetails.html
  
Initialize the solar calculator using the initSolarCalc() function, which
lets you specify:
* `tzOffset` 	- time zone Offset from Greenwich Mean Time (UTC). Time zones west of GMT should be given negative values. For example, Pacific Standard Time is -8

* `lat`	- Latitude of the location you want to use. Values north of the equator are positive, given in decimal degrees.
 
 * `lon`  - Longitude of the location you want to use. Values in the western hemisphere have negative values (0 to -180), given in decimal degrees. For example: Monterey, California has lat/lon (36.62, -121.904)
 
 After running `initSolarCalc()` in the Arduino `setup` loop, you can call any of the 
 extractor functions to get the position of the sun and sunrise/sunset times.
 Each extractor function requires a Time value as input, from the `Time`
 library. The Time is given as seconds since 1970-1-1 00:00 (unix epoch).
 
 Useful functions, supplied with a time value t as the sole argument:
 * 		`getSAA(t)`		- Solar Azimuth (degrees clockwise from North)
 * 		`getSEC_Corr(t)`	- Solar Elevation, corrected for diffraction (degrees)
 * 		`getSZA(t)`		- Solar Zenith angle (degrees below straight up)
 * 		`getSunriseTime(t)`	- Sunrise Time for the current day 	(Time object)
 * 		`getSunsetTime(t)`	- Sunset Time for the current day	(Time object)
 * 		`getSolarNoonTime(t)`	- Solar Noon for the current day	(Time object)
 * 		`getSunDuration(t)`	- Minutes of Sunlight for the current day

## **WARNING**
 This has only tested on 32-bit ARM Teensy 3.0/3.1/3.5/3.6. This library will probably fail 
 horribly on 8-bit AVR products such as the Arduino Uno due to limits in precision 
 of double/float values. You can check your results against the NOAA calculator:
 http://www.esrl.noaa.gov/gmd/grad/solcalc/
 
 Thanks to Raoul Smeets for catching a typo in the Approximate Atmospheric Refraction 
 calculation (SE.AAR in calcSolar() function). 2021-04-19

Solarlib

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