jbreckmckye/daylight: a command-line program for tracking sunrise and sunset times

2025-03-09 08:21:00
github.com

a command-line program for tracking sunrise and sunset times (Mac / Linux)

It tells you the sunrise, sunset, solar noon times and day length. It also projects these changes over the
next ten days.

daylight uses your IP-based location and timezone to tailor the results to your geometry. It works in (ant)arctic
locations, and you can override the IP location if you’re travelling / on a VPN.

I love the sunlight and dread the long, dark winter evenings of Northern Europe. I often look up sunrise / sunset times
and count off the days until the dreary darkness is gone.

(IP lookup is powered by https://ipinfo.io. They provide a good service so please don’t spam requests.)

Homebrew (MacOS and Linux)

# Add my tap (formula repository)
brew tap jbreckmckye/formulae
# Install daylight
brew install daylight
# Check it
daylight --help

Manual installation (and Windows)

Pick up the executable for your system in the releases.
Unzip the package and put the program in a folder that’s within your system PATH.

There is a Windows binary but I haven’t been able to test this. Let me know if you get it working.

# Today's data for your IP location
daylight

# Override the IP location and timezone
daylight -loc-"-33.92,18.42" --timezone "Africa/Johannesburg"

# Short summary of the data
daylight --short

# Data for another date
daylight --date="2025-12-31"

# Disable the colour output
NO_COLOR=true daylight

# Show help
daylight --help

Daylight will attempt to adapt to your terminal background colour (dark vs light) but this might not work well for your
colour scheme. In this case you can use NO_COLOR to disable any colours

$ NO_COLOR=true daylight

Today's daylight
════════════════════════════════════════════════════════════════════════════


             Rises                 Noon                  Sets
           06:30 AM              12:11 PM              17:52 PM



Day length
════════════════════════════════════════════════════════════════════════════

           Daylight for:                    versus yesterday:
          11 hrs, 22 mins                        +3m 58s

 ....................R---------------------------------S..................

Ten day projection
════════════════════════════════════════════════════════════════════════════

   ┌────────────────┬──────────────┬──────────────┬─────────────────────┐
   │      DATE      │   SUNRISE    │    SUNSET    │       LENGTH        │
   ├────────────────┼──────────────┼──────────────┼─────────────────────┤
   │   Sun Mar 09   │   06:28 AM   │   17:54 PM   │   11 hrs, 26 mins   │
   │   Mon Mar 10   │   06:25 AM   │   17:55 PM   │   11 hrs, 30 mins   │
   │   Tue Mar 11   │   06:23 AM   │   17:57 PM   │   11 hrs, 34 mins   │
   │   Wed Mar 12   │   06:21 AM   │   17:59 PM   │   11 hrs, 37 mins   │
   │   Thu Mar 13   │   06:19 AM   │   18:01 PM   │   11 hrs, 41 mins   │
   │   Fri Mar 14   │   06:16 AM   │   18:02 PM   │   11 hrs, 45 mins   │
   │   Sat Mar 15   │   06:14 AM   │   18:04 PM   │   11 hrs, 49 mins   │
   │   Sun Mar 16   │   06:12 AM   │   18:06 PM   │   11 hrs, 53 mins   │
   │   Mon Mar 17   │   06:09 AM   │   18:07 PM   │   11 hrs, 57 mins   │
   │   Tue Mar 18   │   06:07 AM   │   18:09 PM   │   12 hrs, 1 mins    │
   └────────────────┴──────────────┴──────────────┴─────────────────────┘

Your stats
════════════════════════════════════════════════════════════════════════════

 LOCATION  Latitude 51.51, Longitude -0.1257        IP ADDRESS  146.90.4.96

There is also a short summary mode

$ daylight --short
Rises:  06:30 AM
Sets:   17:52 PM
Length: 11 hrs, 22 mins
Change:  +3m 58s

I wrote this project to learn Go, so don’t expect anything too amazing. Feel free to raise issues.

The terminal UI library is lipgloss.

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