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en:hydro:sunset-hour-angle [2016/07/09 21:09] – external edit 127.0.0.1en:hydro:sunset-hour-angle [2024/04/10 10:02] (current) – external edit 127.0.0.1
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 $$ \omega_s = arccos(-tan(\phi)*tan(\delta))$$ $$ \omega_s = arccos(-tan(\phi)*tan(\delta))$$
  
-where $\phi$ is the latitude of the site. The latitude is positive for the northern hermisphere and negative for the southern hemisphere. The symbol $\delta$ is the [[en:hydrology:solar-declination|solar declination]] in radians. The sunset hour angle is needed for the calculation of [[en:hydrology:daylight-hours|daylight hours]].+where $\phi$ is the latitude of the site. The latitude is positive for the northern hermisphere and negative for the southern hemisphere. The symbol $\delta$ is the [[en:hydro:solar-declination|solar declination]] in radians. The sunset hour angle is needed for the calculation of [[en:hydro:daylight-hours|daylight hours]].
  
-For a given latitude $\phi$ and using the [[en:hydrology:solar-declination|solar declination]] as a function of the Julian day number $J$ the sunset hour angle can be calculated with the following Python code. Exampe: latitude = 48 degrees north.+For a given latitude $\phi$ and using the [[en:hydro:solar-declination|solar declination]] as a function of the Julian day number $J$ the sunset hour angle can be calculated with the following Python code. Exampe: latitude = 48 degrees north.
  
 <file py sunsetangle.py> <file py sunsetangle.py>
/usr/www/users/uhydro/doku/data/attic/en/hydro/sunset-hour-angle.1468091353.txt.gz · Last modified: 2024/04/10 10:15 (external edit)