func ExampleLunar_1997() {
// Example 54.d, p. 386.
t, jm, γ, ρ, σ, mag, sdTotal, sdPartial, sdPenumbral :=
eclipse.Lunar(1997.7)
switch t {
case eclipse.None:
fmt.Println("No eclipse")
return
case eclipse.Penumbral:
fmt.Println("Penumbral eclipse")
case eclipse.Umbral:
fmt.Println("Umbral eclipse")
case eclipse.Total:
fmt.Println("Total eclipse")
default:
panic(t)
}
fmt.Printf("Magnitude: %+.4f\n", mag)
fmt.Printf("Time of maximum eclipse: %.4f\n", jm)
fmt.Printf("Minimum distance, γ: %+.4f\n", γ)
if t >= eclipse.Umbral {
fmt.Printf("Umbral radius, σ: %+.4f\n", σ)
}
fmt.Printf("Penumbral radius, ρ: %+.4f\n", ρ)
switch t {
case eclipse.Total:
fmt.Printf("Totality semiduration: %3.0f min\n",
sdTotal.Min())
fallthrough
case eclipse.Umbral:
fmt.Printf("Partial phase semiduration: %3.0f min\n",
sdPartial.Min())
fallthrough
default:
fmt.Printf("Penumbral semiduration: %3.0f min\n",
sdPenumbral.Min())
}
// Output:
// Total eclipse
// Magnitude: +1.1868
// Time of maximum eclipse: 2450708.2835
// Minimum distance, γ: -0.3791
// Umbral radius, σ: +0.7534
// Penumbral radius, ρ: +1.2717
// Totality semiduration: 30 min
// Partial phase semiduration: 98 min
// Penumbral semiduration: 153 min
}
func ExampleLunar_1973() {
// Example 54.c, p. 385.
t, jm, γ, ρ, σ, mag, sdTotal, sdPartial, sdPenumbral :=
eclipse.Lunar(1973.46)
switch t {
case eclipse.None:
fmt.Println("No eclipse")
return
case eclipse.Penumbral:
fmt.Println("Penumbral eclipse")
case eclipse.Umbral:
fmt.Println("Umbral eclipse")
case eclipse.Total:
fmt.Println("Total eclipse")
default:
panic(t)
}
fmt.Printf("Magnitude: %+.4f\n", mag)
fmt.Printf("Time of maximum eclipse: %.4f\n", jm)
fmt.Printf("Minimum distance, γ: %+.4f\n", γ)
if t >= eclipse.Umbral {
fmt.Printf("Umbral radius, σ: %+.4f\n", σ)
}
fmt.Printf("Penumbral radius, ρ: %+.4f\n", ρ)
switch t {
case eclipse.Total:
fmt.Printf("Totality semiduration: %3.0f min\n",
sdTotal*24*60)
fallthrough
case eclipse.Umbral:
fmt.Printf("Partial phase semiduration: %3.0f min\n",
sdPartial*24*60)
fallthrough
default:
fmt.Printf("Penumbral semiduration: %3.0f min\n",
sdPenumbral*24*60)
}
// Output:
// Penumbral eclipse
// Magnitude: +0.4625
// Time of maximum eclipse: 2441849.3687
// Minimum distance, γ: -1.3249
// Penumbral radius, ρ: +1.3045
// Penumbral semiduration: 101 min
}