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mocchiut |
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//
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// cJulian.h
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//
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// Copyright (c) 2003 Michael F. Henry
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//
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#pragma once
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#include "globals.h"
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#include <time.h>
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//
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// See note in cJulian.cpp for information on this class and the epoch dates
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//
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const double EPOCH_JAN1_00H_1900 = 2415019.5; // Jan 1.0 1900 = Jan 1 1900 00h UTC
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const double EPOCH_JAN1_12H_1900 = 2415020.0; // Jan 1.5 1900 = Jan 1 1900 12h UTC
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const double EPOCH_JAN1_12H_2000 = 2451545.0; // Jan 1.5 2000 = Jan 1 2000 12h UTC
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//////////////////////////////////////////////////////////////////////////////
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class cJulian
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{
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public:
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cJulian() { Initialize(2000, 1); }
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explicit cJulian(time_t t); // Create from time_t
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explicit cJulian(int year, double day); // Create from year, day of year
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explicit cJulian(int year, // i.e., 2004
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int mon, // 1..12
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int day, // 1..31
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int hour, // 0..23
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int min, // 0..59
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double sec = 0.0); // 0..(59.999999...)
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~cJulian() {};
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double toGMST() const; // Greenwich Mean Sidereal Time
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double toLMST(double lon) const; // Local Mean Sideral Time
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time_t toTime() const; // To time_t type - avoid using
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double FromJan1_00h_1900() const { return m_Date - EPOCH_JAN1_00H_1900; }
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double FromJan1_12h_1900() const { return m_Date - EPOCH_JAN1_12H_1900; }
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double FromJan1_12h_2000() const { return m_Date - EPOCH_JAN1_12H_2000; }
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void getComponent(int *pYear, int *pMon = NULL, double *pDOM = NULL) const;
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double getDate() const { return m_Date; }
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void addDay (double day) { m_Date += day; }
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void addHour(double hr ) { m_Date += (hr / HR_PER_DAY ); }
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void addMin (double min) { m_Date += (min / MIN_PER_DAY); }
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void addSec (double sec) { m_Date += (sec / SEC_PER_DAY); }
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double spanDay (const cJulian& b) const { return m_Date - b.m_Date; }
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double spanHour(const cJulian& b) const { return spanDay(b) * HR_PER_DAY; }
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double spanMin (const cJulian& b) const { return spanDay(b) * MIN_PER_DAY; }
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double spanSec (const cJulian& b) const { return spanDay(b) * SEC_PER_DAY; }
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static bool IsLeapYear(int y)
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{ return (y % 4 == 0 && y % 100 != 0) || (y % 400 == 0); }
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protected:
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void Initialize(int year, double day);
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double m_Date; // Julian date
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};
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