Define the location of the observation site to be used when calculating the altitude and the azimuth position of objects in the chart.
It is important to select correctly the observatory time zone in order to calculate the difference with UT and Daylight Saving
setting. This is basic for correct chart and ephemeris calculation.
You can simulate the local horizon line as a line or an area.
Definition of local horizon line is stored as pairs of degrees values (azimuth, altidude) beginning at North (azimuth 0°).
You can want to see objects below horizon line.
You can simulate a depressed horizon line, if your Site is on a big moutain.
Above all, you can specify temperature and pressure. This allow SkyChart to calculate atmospheric refraction.