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Every project needs information about where on the world it is located. This information is used later to determine the brightness and position (azimuth and elevation) of the sun at specific times of the year and the day. The brightness distribution of the sky is then determined as a function dependent of the sky position. No simulation can currently be run without this information, so it is a good idea to fill it in right at the start.
Name of Location
This is the name of a place that can be used to
communicate the location to people. It is not directly
used in simulations, except in human readable comments
in output files and as a search key when looking up
locations in the internal database.
Select...
This button offers to select a location from a database of
many cities worldwide. Selecting a location this way
will automatically set the coorinates below to the
correct values of the location.
![[dialog]](images/locedit.gif)
Longitude
The longitude is the angular east-west position of a
place relative to the Town of Greenwich near London (UK).
Positions east of Greenwich have positive values, west of
Greenwich negative.
Values go from -180 degrees to +180 degrees.
Latitude
The latitude is the angular distance of a place from
the equator, with positive values north and negative
values south. Points on the equator have a latitude
of 0 degrees, the north pole is at +90 degrees and
the south pole at -90 degrees.
Timezone
The timezone defines how the clocks
are running at a specific location. The official
timezones are usually set in steps of one hour (or
half a hour in some exceptional cases). Again, positive
values designate timezones east of Greenwich (up to
12 hours) and negative ones west (up to -12 hours).
One hour of timezone corresponds to 15 degrees of
latitude. This means that if the longitude is eg.
-122.04 for Berkeley CA, then the timezone will most
likely be near -8 hours, locating the standard meridian
for California at -120 degrees. If the timezone entered
is more than 3 hours away from the solar time of the
longitude, then you will see a warning when closing
the dialog, with the possibility to go back for correction.
Notice: Users located in America will notice that the signs of longitude and timezone are exactly reverse to what they are used to. Since Rayfront is written for a global audience, we chose to follow international standards here, which specify that longitude values east of Greenwich are positive, and west of Greenwich negative.
Model X-Axis Deviation from East:
Your geometry model may not be aligned exactly to
it's designated north/south orientation for practical reasons.
If this is the case, then you should enter here by how
many degrees the X-axis deviates from the
east direction (which is the same as Y from north).
This makes sure that the sun will shine from the
right direction in the simulations.
The diagram gives immediate feedback on the effect
of the angle entered.
Ok - use the entered values and close the dialog.
Cancel - discard the entered values and close the dialog.
Revert - discard the entered values and reset all fields to the values they had when the dialog opened.
Help... - display this information.
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