pluto

Documentation

Overview

Pluto: Chapter 37, Pluto.

Index

• func Astrometric(jde float64, e *pp.V87Planet) (α unit.RA, δ unit.Angle)
• func Heliocentric(jde float64) (l, b unit.Angle, r float64)

Examples

• Astrometric
• Heliocentric

Functions

func Astrometric

func Astrometric(jde float64, e *pp.V87Planet) (α unit.RA, δ unit.Angle)

Astrometric returns J2000 astrometric coordinates of Pluto.

J2000冥王星地心赤道坐标

Example

// Example 37.a, p. 266
e, err := pp.LoadPlanet(pp.Earth)
if err != nil {
	fmt.Println(err)
	return
}
α, δ := pluto.Astrometric(2448908.5, e)
fmt.Printf("α: %.1d\n", sexa.FmtRA(α))
fmt.Printf("δ: %.0d\n", sexa.FmtAngle(δ))

Output:

α: 15ʰ31ᵐ43ˢ.8
δ: -4°27′29″

func Heliocentric

func Heliocentric(jde float64) (l, b unit.Angle, r float64)

Heliocentric returns J2000 heliocentric coordinates of Pluto.

J2000冥王星日心黄道坐标

Results l, b are solar longitude and latitude in radians. Result r is distance in AU.

Example

package main

import (
	"fmt"

	"github.com/mooncaker816/learnmeeus/v3/pluto"
)

func main() {
	// Example 37.a, p. 266
	l, b, r := pluto.Heliocentric(2448908.5)
	fmt.Printf("l: %.5f\n", l.Deg())
	fmt.Printf("b: %.5f\n", b.Deg())
	fmt.Printf("r: %.6f\n", r)
}

Output:

l: 232.74071
b: 14.58782
r: 29.711111