Astral
Calculations for the position of the sun and moon.
This is a Go port of the Python astral package.
The astral package provides the means to calculate the following times of the sun:
- dawn
- sunrise
- noon
- midnight
- sunset
- dusk
- daylight
- night
- twilight
- blue hour
- golden hour
rahukaalamTODO
plus solar azimuth and elevation at a specific latitude/longitude. It can also calculate the moon phase for a specific date.
CLI
Besides the package for usage in you own programs, we also provide a tool for showing the data.
Installation
Homebrew
brew install sj14/tap/astral
Manually
go get -u github.com/sj14/astral/cmd/astral
Usage
Usage of astral:
-elev float
elevation of the observer
-lat float
latitude of the observer
-long float
longitude of the observer
-time string
day/time used for the calculation (defaults to current time)
Example
$ astral -lat 51.58 -long 6.52
Date/Time Fri Apr 30 21:12:11 CEST 2021
Latitude 51.58
Longitude 6.52
Elevation 0
Daylight 14h48m11s
Night-Time 9h9m55s
Moon Phase Full Moon (17.611222222222224)
Apr 30 03:39 (-17:32) Dawn (Astronomical)
Apr 30 04:39 (-16:32) Dawn (Nautical)
Apr 30 05:28 (-15:43) Dawn (Civil) Twilight Start Blue Hour Start
Apr 30 05:43 (-15:28) Golden Hour Start Blue Hour End
Apr 30 06:07 (-15:04) Sunrise Twilight End
Apr 30 06:53 (-14:18) Golden Hour End
Apr 30 13:31 (-07:41) Noon
Apr 30 20:09 (-01:02) Golden Hour Start
Apr 30 20:55 (-00:16) Sunset Twilight Start
┈┈┈┈┈┈ 21:12 ┈┈┈┈┈┈┈┈ ┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
Apr 30 21:19 (+00:07) Golden Hour End Blue Hour Start
Apr 30 21:34 (+00:22) Dusk (Civil) Twilight End Blue Hour End
Apr 30 22:24 (+01:12) Dusk (Nautical)
Apr 30 23:25 (+02:13) Dusk (Astronomical)
May 1 01:31 (+04:18) Midnight