Example #1
0
func ExampleTime() {
	// Example 19.a, p. 121.

	// convert degree data to radians
	r1 := 113.56833 * math.Pi / 180
	d1 := 31.89756 * math.Pi / 180
	r2 := 116.25042 * math.Pi / 180
	d2 := 28.03681 * math.Pi / 180
	r3 := make([]float64, 5)
	for i, ri := range []float64{
		118.98067, 119.59396, 120.20413, 120.81108, 121.41475} {
		r3[i] = ri * math.Pi / 180
	}
	d3 := make([]float64, 5)
	for i, di := range []float64{
		21.68417, 21.58983, 21.49394, 21.39653, 21.29761} {
		d3[i] = di * math.Pi / 180
	}
	// use JD as time to handle month boundary
	jd, err := line.Time(r1, d1, r2, d2, r3, d3,
		julian.CalendarGregorianToJD(1994, 9, 29),
		julian.CalendarGregorianToJD(1994, 10, 3))
	if err != nil {
		fmt.Println(err)
		return
	}
	y, m, d := julian.JDToCalendar(jd)
	dInt, dFrac := math.Modf(d)
	fmt.Printf("%d %s %.4f\n", y, time.Month(m), d)
	fmt.Printf("%d %s %d, at %h TD(UT)\n", y, time.Month(m), int(dInt),
		sexa.NewFmtTime(dFrac*24*3600))
	// Output:
	// 1994 October 1.2233
	// 1994 October 1, at 5ʰ TD(UT)
}
Example #2
0
func ExampleTime() {
	// Example 19.a, p. 121.
	r1 := unit.AngleFromDeg(113.56833)
	d1 := unit.AngleFromDeg(31.89756)
	r2 := unit.AngleFromDeg(116.25042)
	d2 := unit.AngleFromDeg(28.03681)
	r3 := make([]unit.Angle, 5)
	for i, ri := range []float64{
		118.98067, 119.59396, 120.20413, 120.81108, 121.41475} {
		r3[i] = unit.AngleFromDeg(ri)
	}
	d3 := make([]unit.Angle, 5)
	for i, di := range []float64{
		21.68417, 21.58983, 21.49394, 21.39653, 21.29761} {
		d3[i] = unit.AngleFromDeg(di)
	}
	// use JD as time to handle month boundary
	jd, err := line.Time(r1, d1, r2, d2, r3, d3,
		julian.CalendarGregorianToJD(1994, 9, 29),
		julian.CalendarGregorianToJD(1994, 10, 3))
	if err != nil {
		fmt.Println(err)
		return
	}
	y, m, d := julian.JDToCalendar(jd)
	dInt, dFrac := math.Modf(d)
	fmt.Printf("%d %s %.4f\n", y, time.Month(m), d)
	fmt.Printf("%d %s %d, at %h TD(UT)\n", y, time.Month(m), int(dInt),
		sexa.FmtTime(unit.TimeFromDay(dFrac)))
	// Output:
	// 1994 October 1.2233
	// 1994 October 1, at 5ʰ TD(UT)
}