func TestEarth(t *testing.T) {
// p. 273
j := pa.Perihelion(pa.EMBary, 1990)
y, m, d := julian.JDToCalendar(j)
if y != 1990 || m != 1 || int(d) != 3 {
t.Fatal(y, m, d)
}
j = pa.Perihelion(pa.Earth, 1990)
y, m, df := julian.JDToCalendar(j)
d, f := math.Modf(df)
if y != 1990 || m != 1 || int(d) != 4 || int(f*24+.5) != 16 {
t.Fatal(y, m, df)
}
}
func ExamplePerihelion() {
// Example 38.a, p. 270
j := pa.Perihelion(pa.Venus, 1978.79)
fmt.Printf("%.3f\n", j)
y, m, df := julian.JDToCalendar(j)
d, f := math.Modf(df)
fmt.Printf("%d %s %d at %dʰ\n", y, time.Month(m), int(d), int(f*24+.5))
// Output:
// 2443873.704
// 1978 December 31 at 5ʰ
}
func ExampleEllipticAscending_venus() {
// Example 39.c, p. 278
var k elementplanet.Elements
elementplanet.Mean(elementplanet.Venus,
julian.CalendarGregorianToJD(1979, 1, 1), &k)
t, _ := node.EllipticAscending(k.Axis, k.Ecc,
k.Peri-k.Node,
perihelion.Perihelion(perihelion.Venus, 1979))
y, m, d := julian.JDToCalendar(t)
fmt.Printf("%d %s %.3f\n", y, time.Month(m), d)
// Output:
// 1978 November 27.409
}
func TestJS(t *testing.T) {
// p. 270
j := pa.Aphelion(pa.Jupiter, 1981.5)
y, m, d := julian.JDToCalendar(j)
if y != 1981 || m != 7 || int(d) != 19 {
t.Fatal(y, m, d)
}
s := pa.Perihelion(pa.Saturn, 1944.5)
y, m, d = julian.JDToCalendar(s)
if y != 1944 || m != 7 || int(d) != 30 {
t.Fatal(y, m, d)
}
}