@hebcal/solar-calc
v1.1.2
Published
A sunrise/sunset/moonrise/moonset calculator - fork
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A fork of https://github.com/jonhester/solar-calc to return NaN
Date objects when there is no sunset at extreme latitudes
solar-calc
A sunrise and sunset calculator for npm based on the NOAA Solar Calculator.
Gladly accepting pull requests!
var SolarCalc = require('solar-calc');
// SolarCalc(date,lat,long)
var solar = new SolarCalc(new Date('Mar 8 2015'),35.78,-78.649999);
solar.sunrise // 2015-03-08T11:35:30.000Z
Properties
All properties are Date
objects unless otherwise noted
sunrise
When the upper edge of the Sun appears over the eastern horizon in the morning (0.833 degrees)sunset
When the upper edge of the Sun disappears below the horizoncivilDawn
when there is enough light for objects to be distinguishable. This occurs when the sun is 6 degrees below the horizon in the morningnauticalDawn
When there is enough sunlight for the horizon and some objects to be distinguishable. This occurs when the Sun is 12 degrees below the horizon in the morningastronomicalDawn
when the sky is no longer completely dark. This occurs when the Sun is 18 degrees below the horizon in the morningcivilDusk
When the sun is 6 degrees below the horizon in the evening. At this time objects are distinguishable and some stars and planets are visible to the naked eye.nauticalDusk
When the sun is 12 degrees below the horizon in the evening. At this time, objects are no longer distinguishable, and the horizon is no longer visible to the naked eyeastronomicalDusk
When the sun is 18 degrees below the horizon in the evening. At this time the sun no longer illuminates the sky, and thus no longer interferes with astronomical observationssolarNoon
When the sun transits the celestial meridian – roughly the time when it is highest above the horizonlunarDistance
(integer) the distance from the center of the eart to the center of the moon in kilometersluminosty
(number) the percentage of the moon that is illuminated in decimal form