moonnode

Documentation

Overview

Moonnode: Chapter 51, Passages of the Moon through the Nodes.

Index

• func Ascending(year float64) float64
• func Descending(year float64) float64

Examples

• Ascending

Functions

func Ascending

func Ascending(year float64) float64

Ascending returns the date of passage of the Moon through an ascending node. 升交点对应的力学时

Argument year is a decimal year specifying a date near the event.

Returned is the jde of the event nearest the given date.

Example

// Example 51.a, p. 365.
j := moonnode.Ascending(1987.37)
fmt.Printf("%.5f\n", j)
y, m, d := julian.JDToCalendar(j)
d, f := math.Modf(d)
fmt.Printf("%d %s %d, at %d TD\n", y, time.Month(m), int(d),
	sexa.FmtTime(unit.TimeFromDay(f)))

Output:

2446938.76803
1987 May 23, at 6ʰ25ᵐ58ˢ TD

func Descending

func Descending(year float64) float64

Descending returns the date of passage of the Moon through a descending node. 降交点对应的力学时

Argument year is a decimal year specifying a date near the event.

Returned is the jde of the event nearest the given date.