Free sunset software for linux

crystal_sunrise SuperKaramba theme is based on Flavio Cardones sunrise theme. (http://www.kde-look.org/content/show.php/sunrise?content=25030)

It shows the local time of sunrise, sunset, meridian and the length of day at your location.

Note: Youll need to edit the script and set the coordinates of your city. (default is Karlsruhe/Germany)

DateTime::Astro::Sunrise is a Perl DateTime extension for computing the sunrise/sunset on a given day.

SYNOPSIS

use DateTime; use DateTime::Astro::Sunrise; ^

my $dt = DateTime->new( year => 2000,
month => 6,
day => 20,
);
my $sunrise = DateTime::Astro::Sunrise ->new(-118,33,undef,1);
my ($tmp_rise, $tmp_set) = $sunrise->sunrise($dt);

This module will return a DateTime Object for sunrise and sunset for a given day.

USAGE

my $sunrise = DateTime::Astro::Sunrise -new(longitutide,latatude,ALT,Iteration);>
inter is set to either 0 or 1. If set to 0 no Iteration will occur. If set to 1 Iteration will occur. Default is 0.
There are a number of sun altitides to chose from. The default is -0.833 because this is what most countries use. Feel free to specify it if you need to. Here is the list of values to specify altitude (ALT) with:

0 degrees

Center of Suns disk touches a mathematical horizon

-0.25 degrees

Suns upper limb touches a mathematical horizon

-0.583 degrees

Center of Suns disk touches the horizon; atmospheric refraction accounted for

-0.833 degrees

Suns supper limb touches the horizon; atmospheric refraction accounted for

-6 degrees

Civil twilight (one can no longer read outside without artificial illumination)

-12 degrees

Nautical twilight (navigation using a sea horizon no longer possible)

-15 degrees

Amateur astronomical twilight (the sky is dark enough for most astronomical observations)

-18 degrees

Astronomical twilight (the sky is completely dark)

Notes on Iteration

The orginal method only gives an approximate value of the Suns rise/set times. The error rarely exceeds one or two minutes, but at high latitudes, when the Midnight Sun soon will start or just has ended, the errors may be much larger. If you want higher accuracy, you must then use the iteration feature. This feature is new as of version 0.7. Here is what I have tried to accomplish with this.

a) Compute sunrise or sunset as always, with one exception: to convert LHA from degrees to hours, divide by 15.04107 instead of 15.0 (this accounts for the difference between the solar day and the sidereal day.
b) Re-do the computation but compute the Suns RA and Decl, and also GMST0, for the moment of sunrise or sunset last computed.
c) Iterate b) until the computed sunrise or sunset no longer changes significantly. Usually 2 iterations are enough, in rare cases 3 or 4 iterations may be needed.

($sunrise, $sunset) = $sunrise->($dt);

Returns two DateTime objects sunrise and sunset. Please note that the time zone for these objects is set to UTC. So dont forget to set your timezone!!

Equinox Desktop Environment (shortly EDE) is small desktop environment, builted to be simple and fast.
Comparing to other desktop environments, EDE is much faster and smaller in memory space (EDEs window manager use less memory than xterm).
The word "equinox" comes from the Latin for "equal night". The equinoxes in March and September are the two occasions each year when the day and the night are of equal duration.
For measuring the length of a day, sunrise is the moment when the sun is half-above the horizon and sunset is the moment when the sun is half-under the horizon. Using this definition, the length of the day (and the night) is precisely 12 hours at an equinox.
Main features:
- desktop with icons and wallpaper;
- Xft font anti-aliasing;
- taskbar with configurable menu, cpu status, easy keyboard switching;
- theming;
- localization;
Graphical front-end for:
- xscreensaver configuration;
- software installation (.rpm, .deb, .tgz);
- time and time-zone configuration;
- fast file and directory serch utility;

Agenda is a Web-based application that let you manage your appointments.
It can display information by day, week, month, and year. Agenda Displayer supports official holidays.
Enhancements:
- This release added a world clock, an astrological calendar, a todo handler, a login system, a countdown function, support for generating iCal files with a .ics extension, a new way to handle your annual days off, sunrise and sunset times, and moon phase classes.

Gcal is a program for calculating and printing calendars. It displays hybrid and proleptic Julian and Gregorian calendar sheets, respectively for one month, three months, or a whole year.
It also displays eternal holiday lists for many countries around the globe, and features a very powerful creation of fixed date liststhat can be used for reminding purposes. Gcal can calculate various astronomical data and times of the Sun and the Moon for pleasure at any location, precisely enough for most civil purposes.
Gcal supports some other calendar systems, for example, the Chinese and Japanese calendars, the Hebrew calendar, and the civil Islamic calendar, too.
English user manual included; German user manual included.
Main features:
- Some special calendar sheet formats.
- Calendar sheets can be provided with week numbers.
- Variable number of year calendar sheet blocks.
- Adjustable ordering of displayed dates.
- Adjustable period of Gregorian Reformation.
- Proleptic Julian and Gregorian calendars.
- Adjustable highlighting of holidays and actual day.
- Variable starting day of week.
- Output of day-of-year numbers and concatenated day and day-of-year numbers.
- Allows user-defined ordering of the date elements.
- Output of fiscal years.
- Output of lists or ranges of months or years.
- Sorted output of selectable country/territory specific eternal holiday lists (mostly complete) for nearly *all* countries around the globe, which are generated automatically.
- Sorted output of Christian Western churches calendar holidays, Orthodox Christian Eastern churches old and new calendar holidays, Hebrew calendar holidays, Islamic civil calendar holidays (since AD 622), Persian "Jalaali" calendar holidays, Chinese and Japanese calendar holidays (since AD 1645), more "other" calendar system holidays, multicultural New Years Days, and start of "other" calendar system months, which are also generated automatically.
- Sorted output of fixed date lists which can be defined and created in a highly flexible manner.
- Allows filtration of fixed dates by using regular expressions and other built-in methods.
- Allows the use of date and text variables and basic operations on them.
- Some gimmicks like solar and lunar eclipse time, sunrise/sunset plus a lot of other Sun based data and times, Moon phase, Full and New Moon time, moonrise/moonset plus a lot of other Moon based data and times, zodiacal markers, equinox and solstice, air line distance between two geographic point locations plus course angles, biorhythm et cetera...
- Fixed dates can be stored in several files.
- Nearly unlimited nesting level of include files.
- Nearly unlimited internal text and table lengths.
- Default options can be stored in the `GCAL environment variable.
- Options and commands stored in response files can be preloaded.
- Uses either an external pager or a simple built-in pager.
- Detailed Texinfo reference manual.
- German, English and American program version by default.
- Supports various computer platforms.
- GNU `gettext internationalization technology, which allows the use of message catalogs for most native languages.
- GNU `autoconf(iguration) installation technology.
- Supports both UN*X short-style options and GNU long-style options.