Lunation Date Calculator

This library is only a couple of functions that are related: something to number lunations (back and forth). It's not hour-precise by itself. It will land within +/- 6 hours.

The equation was derived from this Wolfram page (archive link) to give me some sort of lunation numbering.

It looks like lunation #0 is the 1993-05-21 lunation (lunation #871 with a year 1923 epoch).

Usage Example

Make your Cargo.toml do something like this:

[dependencies]
lunations = {git = "https://github.com/arossbell/lunations"}

Inclusion:

extern crate lunations;

use lunations::*;

JD to lunation (f64 -> f64):

println!("{}", jd_lunation(2450744.365));

(Prints 54.715299381818)

Lunation to JD (f64 -> f64):

println!("{}", lunation_jd(55.0));

(Prints 2450752.77237685)

To make the JD of a lunation more precise, you could use the time_of_phase function from the astro-rust crate.

Dependencies:

• This code isn't (yet) that sophisticated.