1 files changed, 61 insertions, 0 deletions
diff --git a/src/ru/olamedia/astronomy/JulianDate.java b/src/ru/olamedia/astronomy/JulianDate.java
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+++ b/src/ru/olamedia/astronomy/JulianDate.java
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+package ru.olamedia.astronomy;
+
+/*
+ *  Copyright 2011 Brad Parks
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+//package com.bradsbrain.simpleastronomy;
+
+import java.util.Calendar;
+
+/**
+ * Heavily based on procedures as documented in the book
+ * "Practical Astronomy with Your Calculator", 3rd Edition, by Peter
+ * Duffett-Smith, Cambridge University Press, 1988, 1990, 1992
+ * 
+ * @author bradparks
+ */
+public class JulianDate {
+
+	/**
+	 * This method is a simplification of formula in Section 3 of PAwyC3. We'll
+	 * assume we're only talking about Gregorian Calendar dates because really,
+	 * we don't care a whole lot about past dates.
+	 * 
+	 * @param cal
+	 * @return
+	 */
+
+	public static double makeJulianDateUsingMyModified(Calendar cal) {
+		Calendar myCal = BaseUtils.getSafeLocalCopy(cal.getTimeInMillis());
+		// step 1
+		int year = myCal.get(Calendar.YEAR);
+		int month = myCal.get(Calendar.MONTH) + 1; // fix the January=0
+		double day = myCal.get(Calendar.DAY_OF_MONTH);
+		double hour = myCal.get(Calendar.HOUR_OF_DAY) / 24.0;
+		double minute = myCal.get(Calendar.MINUTE) / 24.0 / 60.0;
+		double second = myCal.get(Calendar.SECOND) / 24.0 / 60.0 / 60.0;
+
+		// step 2
+		if (month <= 2) {
+			year--;
+			month += 12;
+		}
+
+		// step 6
+		return 1720995.5 + Math.floor(365.243 * year)
+				+ Math.floor(30.6 * ++month) + day + hour + minute + second;
+	}
+
+}
+\ No newline at end of file