Hi All,
This is to announce a new release of Astro::Sunrise perl module.
This is a complete rewrite of the module/added new functionality.
Enjoy!!
Ron Hill
NAME
Astro::Sunrise - Perl extension for computing the sunrise/sunset on a
given day
SYNOPSIS
use Astro::Sunrise;
($sunrise, $sunset) = sunrise(YYYY,MM,DD,longitude,latitude,Time
Zone,DST);
($sunrise, $sunset) = sunrise(YYYY,MM,DD,longitude,latitude,Time
Zone,DST,ALT);
$sunrise = sun_rise(longitude,latitude);
$sunset = sun_set(longitude,latitude);
$sunrise = sun_rise(longitude,latitude,ALT);
$sunset = sun_set(longitude,latitude,ALT);
$sunrise = sun_rise(longitude,latitude,ALT,day_offset);
$sunset = sun_set(longitude,latitude,ALT,day_offset);
DESCRIPTION
This module will return the sunrise/sunset for a given day.
Eastern longitude is entered as a positive number
Western longitude is entered as a negative number
Northern latitude is entered as a positive number
Southern latitude is entered as a negative number
There are a number of sun altitides to chose from. The default is -0.833
because this is what most countries use. Feel free to specify it if you
need to. Here is the list of values to specify altitude (ALT) with:
0 degrees
Center of Sun's disk touches a mathematical horizon
-0.25 degrees
Sun's upper limb touches a mathematical horizon
-0.583 degrees
Center of Sun's disk touches the horizon; atmospheric refraction
accounted for
-0.833 degrees
Sun's supper limb touches the horizon; atmospheric refraction
accounted for
-6 degrees
Civil twilight (one can no longer read outside without artificial
illumination)
-12 degrees
Nautical twilight (navigation using a sea horizon no longer
possible)
-15 degrees
Amateur astronomical twilight (the sky is dark enough for most
astronomical observations)
-18 degrees
Astronomical twilight (the sky is completely dark)
USAGE
sunrise
"($sunrise, $sunset) = sunrise(YYYY,MM,DD,longitude,latitude,Time
Zone,DST);"
"($sunrise, $sunset) = sunrise(YYYY,MM,DD,longitude,latitude,Time
Zone,DST,ALT);"
Returns the sunrise and sunset times, in HH:MM format. (Note:
Time Zone is the offset from GMT and DST is daylight savings
time, 1 means DST is in effect and 0 is not). In the first form,
a default altitude of -.0833 is used. In the second form, the
altitude is specified as the last argument. Note that adding 1
to the Time Zone during DST and specifying DST as 0 is the same
as indicating the Time Zone correctly and specifying DST as 1.
*For Example*
($sunrise, $sunset) = sunrise( 2001, 3, 10, 17.384, 98.625, -5,
0 );
($sunrise, $sunset) = sunrise( 2002, 10, 14, -105.181,
41.324, -7, 1, -18);
sun_rise
"$sun_rise = sun_rise( longitude, latitude );"
"$sun_rise = sun_rise( longitude, latitude, ALT );"
"$sun_rise = sun_rise( longitude, latitude, ALT, day_offset );"
Returns the sun rise time for the given location. The first form
uses today's date (from Time::Object) and the default altitude.
The second form adds specifying a custom altitude. The third
form allows for specifying an integer day offset from today,
either positive or negative.
*For Example*
$sunrise = sun_rise( -105.181, 41.324 );
$sunrise = sun_rise( -105.181, 41.324, -15 );
$sunrise = sun_rise( -105.181, 41.324, -12, +3 );
$sunrise = sun_rise( -105.181, 41.324, undef, -12);
sun_set
"$sun_set = sun_set( longitude, latitude );"
"$sun_set = sun_set( longitude, latitude, ALT );"
"$sun_set = sun_set( longitude, latitude, ALT, day_offset );"
Returns the sun set time for the given location. The first form
uses today's date (from Time::Object) and the default altitude.
The second form adds specifying a custom altitude. The third
form allows for specifying an integer day offset from today,
either positive or negative.
*For Example*
$sunrise = sun_set( -105.181, 41.324 );
$sunrise = sun_set( -105.181, 41.324, -15 );
$sunrise = sun_set( -105.181, 41.324, -12, +3 );
$sunrise = sun_set( -105.181, 41.324, undef, -12);
AUTHOR
Ron Hill [EMAIL PROTECTED]
SPECIAL THANKS
Robert Creager [[EMAIL PROTECTED]] For providing help with
converting Paul's C code to perl For providing code for sun_rise,
sun_set sub's Also adding options for different altitudes
CREDITS
Paul Schlyer, Stockholm, Sweden
for his excellent web page on the subject.
Rich Bowen ([EMAIL PROTECTED])
for suggestions
Adrian Blockley [[EMAIL PROTECTED]]
for finding a bug in the conversion to local time
Lightly verified against
http://aa.usno.navy.mil/data/docs/RS_OneYear.html
COPYRIGHT and LICENSE
Here is the copyright information provided by Paul Schlyer:
Written as DAYLEN.C, 1989-08-16
Modified to SUNRISET.C, 1992-12-01
(c) Paul Schlyter, 1989, 1992
Released to the public domain by Paul Schlyter, December 1992
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
BUGS
SEE ALSO
perl(1).
