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en:documentation:observatory [2014/03/17 11:51] – [Use an horizon picture] pchen:documentation:observatory [2025/08/20 15:19] (current) – [Use an horizon picture] dokuadmin
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 It is important to select the correct time zone for your observatory because SkyCharts needs it to calculate the //UT// from your //Daylight Savings// setting. This is very important to do proper ephemeris calculations in order to display the right chart.\\ It is important to select the correct time zone for your observatory because SkyCharts needs it to calculate the //UT// from your //Daylight Savings// setting. This is very important to do proper ephemeris calculations in order to display the right chart.\\
 It is recommended to use the country time zone as it correct for DST for any epoch where the rules are know.\\  It is recommended to use the country time zone as it correct for DST for any epoch where the rules are know.\\ 
-If you use the special GMT time zone, beware the hour offset sign is opposite of what you expect, zones west of GMT have a positive sign. See http://en.wikipedia.org/wiki/Tz_database#Area+You can also use an UTC time zone if you want a fixed time along the year.
  
 If you frequently use this observation site you can add it to your favorites list with the Add button after all settings are right for you. If you frequently use this observation site you can add it to your favorites list with the Add button after all settings are right for you.
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 If "High quality" is checked a point is computed for every screen pixel of the map. Otherwise it compute a point only every four pixel. See the discussion about the performance below. If "High quality" is checked a point is computed for every screen pixel of the map. Otherwise it compute a point only every four pixel. See the discussion about the performance below.
  
-This function is compatible with the horizon made for [[http://www.stellarium.org|Stellarium]] using the [[http://www.stellarium.org/wiki/index.php/Customising_Landscapes#Single_Panorama_Method|Single Panorama Method]].\\ +This function is compatible with the horizon made for [[http://www.stellarium.org|Stellarium]] using the [[https://stellarium.org/guide/#pf65|Single Panorama Method]].\\ 
-So the quickest way to test it is to get a [[http://www.stellarium.org/wiki/index.php/Landscapes|landscape file]] for Stellarium. Just be sure the format is compatible by looking at the row "type = spherical" in the landscape.ini file.\\+So the quickest way to test it is to get a [[https://stellarium.org/en/landscapes.html|landscape file]] for Stellarium. Just be sure the format is compatible by looking at the row "type = spherical" in the landscape.ini file.\\
  
-For example download the [[http://www.waldvogel.com/stellarium/landscape_jungfraujoch.zip|Jungfraujoch panorama]], unzip the file in your home folder.\\+For example download the [[https://www.ap-i.net/pub/skychart/horizon/landscape_jungfraujoch.zip|Jungfraujoch panorama]], unzip the file in your home folder.\\
 Launch Skychart and open the observatory setting, add an observatory location for Jungfraujoch as show here (location is not automatically set from landscape.ini but you can look at the file to get the right value):\\ Launch Skychart and open the observatory setting, add an observatory location for Jungfraujoch as show here (location is not automatically set from landscape.ini but you can look at the file to get the right value):\\
  
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 Select a moment you get the most uniform lighting in every direction. A uniform high cloud cover can be good.\\ Select a moment you get the most uniform lighting in every direction. A uniform high cloud cover can be good.\\
 Get a sequence of picture for the whole horizon, be sure to have enough overlap between the pictures.\\ Get a sequence of picture for the whole horizon, be sure to have enough overlap between the pictures.\\
-Use a panorama software like [[http://hugin.sourceforge.net/|Hugin]] to assemble the pictures. Convert the result to PNG format to support transparency. Then use [[http://www.gimp.org/|GIMP]] to set the sky transparent using one of the numerous method available, I found that creating a sky mask first work fine.\\+Use a panorama software like [[http://hugin.sourceforge.net/|Hugin]] to assemble the pictures. Convert the result to PNG format to support transparency. Then use [[http://www.gimp.org/|GIMP]] to set the sky transparent using one of the [[https://www.google.com/search?q=gimp+mask+transparency|numerous method]] available, I found that creating a sky mask first work fine.\\
 Finally reduce the panorama size to a reasonable value, 4096 or 8192 pixel width. Finally reduce the panorama size to a reasonable value, 4096 or 8192 pixel width.
  
-If you observe from a mountainous area I also get success by using an [[http://www.udeuschle.de/Panoramen.html| online panorama generator]]. In the form set your coordinates and "Left edge=90", "Right edge=90", "Tilt=0", "Elev. exaggeration=1". Show the panorama, save all the tiles and assemble in GIMP.+For mountainous area it possible to use an [[panorama| online panorama generator]].\\ 
 +The condition is the horizon is limited by remote mountain, this not work for tree or nearby buildings.  
 + 
 +{{:en:documentation:horizon4.png?600|}} 
    
  
  
-==== The other possibilities ====+===== The other possibilities =====
 The other possibilities will be obvious from their description. \\ The other possibilities will be obvious from their description. \\
 * Maybe you want to display objects below the horizon line. \\ * Maybe you want to display objects below the horizon line. \\
en/documentation/observatory.1395053471.txt.gz · Last modified: 2015/11/06 20:34 (external edit)