Add SunMoonCalc port

[marcelstoer]

My Arduino test bed was as follows:

#include <SunMoonCalc.h>
#include <time.h>
#include <math.h>
#include <Arduino.h>

void output(SunMoonCalc::Result result) {
  Serial.println("Sun");
  Serial.println("\tRise: " + formatTime(result.sun.rise));
  Serial.println("\tNoon: " + formatTime(result.sun.transit));
  Serial.println("\tSet: " + formatTime(result.sun.set));
  Serial.println("\tAzimuth: " + String(result.sun.azimuth) + "°");
  Serial.println("\tElevation: " + String(result.sun.elevation) + "°");
  Serial.println("\tDistance: " + String(result.sun.distance) + "km");
  Serial.println("Moon");
  Serial.println("\tRise: " + formatTime(result.moon.rise));
  Serial.println("\tNoon: " + formatTime(result.moon.transit));
  Serial.println("\tSet: " + formatTime(result.moon.set));
  Serial.println("\tAzimuth: " + String(result.moon.azimuth) + "°");
  Serial.println("\tElevation: " + String(result.moon.elevation) + "°");
  Serial.println("\tDistance: " + String(result.moon.distance) + "km");
  Serial.println("\tAge: " + String(result.moon.age) + " days");
  Serial.println("\tIllumination: " + String(result.moon.illumination * 100) + "%");
  Serial.println("\tPhase: " + result.moon.phase.name);
}

String padWithZeroBelowTen(int d) {
  return d < 10 ? "0" + String(d) : String(d);
}

String formatTime(time_t timestamp) {
  tm *date = gmtime(&timestamp);
  String year = "" + String(date->tm_year + 1900);
  String month = padWithZeroBelowTen(date->tm_mon + 1);
  String day = padWithZeroBelowTen(date->tm_mday);
  return year + "-" + month + "-" + day + " " + padWithZeroBelowTen(date->tm_hour) + ":" +
         padWithZeroBelowTen(date->tm_min) + ":" + padWithZeroBelowTen(date->tm_sec) + " UTC";
}

void setup() {
  Serial.begin(115200);
  Serial.println();
//  struct tm tm{};
//  tm.tm_year = 2018 - 1900;
//  tm.tm_mon = 6 - 1;
//  tm.tm_mday = 8;
//  tm.tm_hour = 20;
//  tm.tm_min = 55;
//  tm.tm_sec = 34;
//  SunMoonCalc smCalc = SunMoonCalc(timegm(&tm), 47.46375, 8.95489);
//  <- Arduino doesn't have timegm => use epoch instant directly
  SunMoonCalc smCalc = SunMoonCalc(1528491334, 47.46375, 8.95489);
  const SunMoonCalc::Result result = smCalc.calculateSunAndMoonData();
  output(result);
}

void loop() {
  // put your main code here, to run repeatedly:
}

It produces

Sun
	Rise: 2018-06-09 03:27:34 UTC
	Noon: 2018-06-08 11:23:13 UTC
	Set: 2018-06-08 19:18:53 UTC
	Azimuth: 325.51°
	Elevation: -12.19°
	Distance: 151851716.82km
Moon
	Rise: 2018-06-09 01:11:21 UTC
	Noon: 2018-06-09 07:29:04 UTC
	Set: 2018-06-08 12:49:30 UTC
	Azimuth: 33.89°
	Elevation: -37.32°
	Distance: 389017.22km
	Age: 24.17 days
	Illumination: 29.18%
	Phase: Waning Crescent

which is extremely close (<1min deviation) to what https://www.timeanddate.com/moon/@6294748 produces.