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Add custom zenith/twilight support. #1

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5 changes: 5 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,11 @@ navigator.geolocation.getCurrentPosition(function(position) {
var sunset = new Date().sunset(position.coords.latitude, position.coords.longitude);
});

//You can set a custom zenith to get twilight times.
//See the source for available zenith values and their meanings.
//Get civil dusk for Forks, WA
var twilight = new Date().sunset(47.95, -124.38, Date.zenith.CIVIL);

```

By Matt Kane (@ascorbic). Copyright © 2012 Triggertrap Ltd. All Rights Reserved.
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16 changes: 15 additions & 1 deletion sun.js
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Expand Up @@ -27,9 +27,23 @@ Date.prototype.sunset = function(latitude, longitude, zenith) {
return this.sunriseSet(latitude, longitude, false, zenith);
}

Date.zenith = {
/** Astronomical sunrise/set is when the sun is 18 degrees below the horizon. */
ASTRONOMICAL: 108,

/** Nautical sunrise/set is when the sun is 12 degrees below the horizon. */
NAUTICAL: 102,

/** Civil sunrise/set (dawn/dusk) is when the sun is 6 degrees below the horizon. */
CIVIL: 96,

/** Official sunrise/set is when the sun is 50' below the horizon. */
OFFICIAL: 90.8333
}

Date.prototype.sunriseSet = function(latitude, longitude, sunrise, zenith) {
if(!zenith) {
zenith = 90.8333;
zenith = Date.zenith.OFFICIAL;
}


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