Change getRefraction() access to public

It had been package-private.

Author: KosherJava

src/main/java/com/kosherjava/zmanim/util/AstronomicalCalculator.java

@@ -229,7 +229,7 @@ public abstract double getUTCSunset(Calendar calendar, GeoLocation geoLocation,
 	 * 
 	 * @return The refraction in arc minutes.
 	 */
-	double getRefraction() {
+	public double getRefraction() {
 		return this.refraction;
 	}