Crate geodate

Geodate

Geodate computes geocentric expressions of points in time using a natural lunisolar calendar with metric time based on decimal fractions of the mean solar day.

Examples

use geodate::geodate;

let timestamp = 1403322675;
let longitude = -1.826189;

assert_eq!("01:14:05:24:15:42", geodate::get_date(timestamp, longitude));

This library also exposes some useful functions implementing algorithms from the reference book Astronomical Algorithms by Jean Meeus to calculate the precise time of any sunrise, solstice, and new moon required to create a lunisolar calendar.

use geodate::earth_orbit;
use geodate::sun_transit;

let timestamp = 1403322675;
let longitude = -1.826189;
let latitude  = 51.178844;

let solstice = earth_orbit::get_previous_december_solstice(timestamp);
assert_eq!(1387645873, solstice);

if let Some(sunrise) = sun_transit::get_sunrise(timestamp, longitude, latitude) {
    assert_eq!(1403322705, sunrise);
}

Note: some functions available in pair, for example get_*_december_solstice() return the previous and next events for the given time, while others, like get_sunrise(), give the event associated with the current implicit time period (day, month).

Modules

delta_time
earth_orbit	Computes solstices and equinoxes times
geodate	Constructs string representations of the time in a geodate format
moon_phase	Computes phases of the Moon and lunation numbers
moon_transit	Computes moonrise and moonset times
sun_transit	Computes sunrise, sunset, midnight, and midday times

Macros

assert_approx_eq