Jul 20, 2023

Perl extension for computing the sunrise/sunset on a given day

This module returns the sunrise/sunset for a given day.

The FreeBSD ports collection gives you a convenient way to build and install custom versions of software on your FreeBSD system. Among the many useful ports provided in the collection, there is the p5-Astro-Sunrise, a user-friendly and versatile module intended for astronomical applications.

The p5-Astro-Sunrise module calculates the time of sunrise and sunset for a specific location. Moreover, it also provides times for other solar events such as civil twilight, nautical twilight, and astronomical twilight. In this article, we will delve into how to utilize the p5-Astro-Sunrise port, giving a thorough overview of its various features, installation process, and its operational intricacies on FreeBSD.

Installing p5-Astro-Sunrise

First off, let’s get started with the installation process. FreeBSD’s ports collection contains the p5-Astro-Sunrise module. To install the port, follow these steps

$ cd /usr/ports/astro/p5-Astro-Sunrise/ && make install clean

This command will move you into the /usr/ports/astro/p5-Astro-Sunrise/ directory and build and install the p5-Astro-Sunrise. Also, it will clean up the workspace after the installation process is over.

Alternatively, you can also install p5-Astro-Sunrise using the package method

$ pkg install p5-Astro-Sunrise

This one-liner command will install the p5-Astro-Sunrise package for you.

Using p5-Astro-Sunrise

The p5-Astro-Sunrise module is an interface to a Perl extension for computing the sunrise/sunset on a given day. To utilize it, a Perl script will be necessary

use AstroSunrise;

my $sunrise, $sunset = sunrise year => 2000, month => 6, day => 20 ;

print "Sunrise is at $sunrise, sunset is at $sunset";

This script will output the sunrise and sunset time for June 20, 2000.

One of the biggest advantages of this module is that you can get times for any day. In the above command, you can modify the ‘year’, ‘month’, and ‘day fields to input the date you want to calculate the sunrise and sunset for.

A More Practical Application

The p5-Astro-Sunrise module allows for versatility of application. You could configure it to be used in combination with other FreeBSD ports to create automated tasks that depend on solar events. For instance, could use the FreeBSD port [Cron https//freebsdsoftware.org/sysutils/cron.html] to set your outdoor lights to switch on at sunset, and switch off at sunrise.

use AstroSunrise;
use ScheduleCronEvents;

my $sunrise, $sunset = sunrise year => 2000, month => 6, day => 20;
my $cron = new ScheduleCronEvents $line, Seconds => time ;

my $nextEvent = $cron->nextEvent;

if $nextEvent eq $sunset 
 elsif $nextEvent eq $sunrise 

This script sets a schedule for the next solar event and triggers particular system actions at sunrise and sunset.


In sum, p5-Astro-Sunrise is a versatile port that provides a great deal of flexibility when you need to calculate solar events. Whether you’re an amateur stargazer planning an optimal viewing time, or a developer automating systems based on solar events, this port offers a practical solution with its straightforward interface and ease of integration with other modules.

Remember, being mindful of your system’s security is always paramount, so while you’re exploring the FreeBSD ports collection and the versatility it offers, we recommend using [nmap https//freebsdsoftware.org/security/nmap.html] for security auditing of your network.

FreeBSD, and its versatile ports collection, truly showcases the capabilities and flexibility of open-source projects like p5-Astro-Sunrise. Happy coding, and clear skies to you all!

Checkout these related ports:
  • Xworld - Earth as seen from the direction of the sun
  • Xtide - Harmonic tide clock and tide predictor
  • Xplanet - Draw pictures of the earth textured by an image
  • Xphoon - Set the root window to the moon in its current phase
  • Xmoontool - Version of John Walker's classical moontool for X11/Motif
  • Xephem - Interactive astronomical ephemeris program
  • Xeartk - Small demo for tkgeomap
  • Xearth - Set the root window to the image of earth
  • Wmsun - Dockapp that displays the rise and set times of the Sun
  • Wmspaceweather - DockApp that shows the weather at geosynchronous orbit
  • Wmsolar - Dockapp that displays the Solar System viewed from the top
  • Wmmoonclock - Displays the phase of the moon, plus orbital data
  • Wmjupiter - Dockapp that displays information on Jupiter
  • Wmglobe - Neat xearth-like WindowMaker dockapp
  • Weather - Utility to provide current weather conditions and forecasts