jupiter

Documentation

Overview

Jupiter: Chapter 43, Ephemeris for Physical Observations of Jupiter.

Index

• func Physical(jde float64, earth, jupiter *pp.V87Planet) (DS, DE, ω1, ω2, P unit.Angle)
• func Physical2(jde float64) (DS, DE, ω1, ω2 unit.Angle)

Examples

• Physical
• Physical2

Functions

func Physical

func Physical(jde float64, earth, jupiter *pp.V87Planet) (DS, DE, ω1, ω2, P unit.Angle)

Physical computes quantities for physical observations of Jupiter.

Results:

DS  Planetocentric declination of the Sun.
DE  Planetocentric declination of the Earth.
ω1  Longitude of the System I central meridian of the illuminated disk,
    as seen from Earth.
ω2  Longitude of the System II central meridian of the illuminated disk,
    as seen from Earth.
P   Geocentric position angle of Jupiter's northern rotation pole.

Example

package main

import (
	"fmt"

	"github.com/soniakeys/meeus/v3/jupiter"
	pp "github.com/soniakeys/meeus/v3/planetposition"
)

func main() {
	// Example 43.a, p. 295
	e, err := pp.LoadPlanet(pp.Earth)
	if err != nil {
		fmt.Println(err)
		return
	}
	j, err := pp.LoadPlanet(pp.Jupiter)
	if err != nil {
		fmt.Println(err)
		return
	}
	DS, DE, ω1, ω2, P := jupiter.Physical(2448972.50068, e, j)
	fmt.Printf("DS = %+.2f\n", DS.Deg())
	fmt.Printf("DE = %+.2f\n", DE.Deg())
	fmt.Printf("ω1 = %.2f\n", ω1.Deg())
	fmt.Printf("ω2 = %.2f\n", ω2.Deg())
	fmt.Printf("P = %.2f\n", P.Deg())
}

Output:

DS = -2.20
DE = -2.48
ω1 = 268.06
ω2 = 72.74
P = 24.80

func Physical2

func Physical2(jde float64) (DS, DE, ω1, ω2 unit.Angle)

Physical2 computes quantities for physical observations of Jupiter.

Results are less accurate than with Physical().

Results:

DS  Planetocentric declination of the Sun.
DE  Planetocentric declination of the Earth.
ω1  Longitude of the System I central meridian of the illuminated disk,
    as seen from Earth.
ω2  Longitude of the System II central meridian of the illuminated disk,
    as seen from Earth.

All angular results in radians.

Example

package main

import (
	"fmt"

	"github.com/soniakeys/meeus/v3/jupiter"
)

func main() {
	// Example 43.b, p. 299
	DS, DE, ω1, ω2 := jupiter.Physical2(2448972.50068)
	fmt.Printf("DS = %+.3f\n", DS.Deg())
	fmt.Printf("DE = %+.2f\n", DE.Deg())
	fmt.Printf("ω1 = %.2f\n", ω1.Deg())
	fmt.Printf("ω2 = %.2f\n", ω2.Deg())
}

Output:

DS = -2.194
DE = -2.50
ω1 = 268.12
ω2 = 72.79