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Sunrise doc changed

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git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@469 2b470e98-0d58-463d-a4d8-8e2adae1ed80
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rudolfkoenig
2009-11-14 08:25:22 +00:00
parent 92d5019e1a
commit 5a0a15b5c6
2 changed files with 53 additions and 23 deletions
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docs/faq.html
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@@ -68,6 +68,9 @@ What is wrong with my USB?
<a href="#faq19">19. How do I set the dim100% from the at command?</a><br>
<a href="#faq20">20. Why do my Sunrise/Sunnset times differ from the ones on
webseite XXX?</a><br>
<br/>
<br/>
@@ -251,16 +254,13 @@ by fhem.pl?</b>
<ul>
Look for the geographic coordinates of your home, e.g with a GPS
receiver or with googleearth. Compute the latitude/longitude as needed, and
enter them in your lastinclude file with the command:
<pre>{sunrise_coord("<latitude>", "<longitude>", "") }</pre>
enter them in your 99_SUNRISE_EL.pm file.
After restart, { sunrise() } will return the time of the next sunrise,
in a HH:MM:SS format.<br><br>
in a HH:MM:SS format. Also note <a href="#faq20">faq20</a><br><br>
Note: 99_SUNRISE_EL.pm is the ExtraLight version of the original
99_SUNRISE.pm, which needs the DateTime::Event::Sunrise perl module, which
in turn is usually difficult to install. If you still want to use the
original module, then the initialization string will be slightly different:
<pre>{sunrise_coord("<latitude>", "<longitude>", "Europe/Berlin") }</pre>
in turn is usually difficult to install.
</ul>
<a name="faq12"></a>
@@ -442,6 +442,41 @@ See <a href="USB.html">USB compendium</a> for help.
type, e.g. <code>FHT</code>) can be used. A single <code>%</code>
looses its special meaning if any of these parameters appears in the
definition.</li>
</ul>
<a name="faq20">
<b>20. Why do my Sunrise/Sunnset times differ from the ones on webseite XXX?</b>
<ul>
There are different ways of defining sunrise/sunset. To quote "perldoc
DateTime::Event::Sunrise" :<br>
<ul>
<li>0 degrees<br>
Center of Sun's disk touches a mathematical horizon
<li>-0.25 degrees<br>
Sun's upper limb touches a mathematical horizon
<li>-0.583 degrees<br>
Center of Sun's disk touches the horizon; atmospheric refraction
accounted for
<li>-0.833 degrees<br>
Sun's supper limb touches the horizon; atmospheric refraction
accounted for
<li>-6 degrees<br>
Civil twilight (one can no longer read outside without artificial
illumination)
<li>-12 degrees<br>
Nautical twilight (navigation using a sea horizon no longer possible)
<li>-15 degrees<br>
Amateur astronomical twilight (the sky is dark enough for most
astronomical observations)
<li>-18 degrees<br>
Astronomical twilight (the sky is completely dark)
</ul>
<br>
The default in fhem is -6, as we most often deal with lamps & reading. Most
websites use -0.833, the difference is normally about 30 minutes. You can
change it in 99_SUNRISE.pm by setting the $altit variable.
</ul>
</body>
</html>