Calculations for the position of the sun and moon.
This is a Go port of the Python astral package.
Check out the latest Go version on Github.
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
rahukaalam TODO
plus solar azimuth and elevation at a specific latitude/longitude.
It can also calculate the moon phase for a specific date.
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CLI
Besides the package for usage in you own programs, we also provide a tool for showing the data.
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Installation
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| go get github.com/sj14/astral/cmd/astral
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Usage
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| Usage of astral:
-elev float
elevation of the observer
-format string
time output format according to Go parsing (default "Jan _2 15:04:05")
-lat float
latitude of the observer
-long float
longitude of the observer
-time string
day/time used for the calculation (defaults to current time)
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Example
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| $ astral -lat 51.58 -long 6.52
Sun Apr 18 11:12:45 CEST 2021
Latitude 51.58 Longitude 6.52 Elevation 0
Apr 18 05:55:07 Dawn
Apr 18 05:55:07 Blue Hour Start
Apr 18 06:09:04 Blue Hour End
Apr 18 06:09:04 Golden Hour Start
Apr 18 06:31:44 Sunrise
Apr 18 07:15:56 Golden Hour End
Apr 18 13:33:18 Noon
Apr 18 19:51:24 Golden Hour Start
Apr 18 20:35:45 Sunset
Apr 18 20:58:33 Golden Hour End
Apr 18 20:58:33 Blue Hour Start
Apr 18 21:12:35 Blue Hour End
Apr 18 21:12:35 Dusk
Apr 19 01:33:13 Midnight
Moon Phase: New Moon (5.47788888888889)
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