[pysolar-discuss] What is horizon in simulate_span func (simulate.py) ?

[Ryan Kapur <ryankapur@xxxxxxxxxxxx>]

What is would be an example value of horizon?  How would I know based upon
my location (Portland, OR). Does it represent degrees; if so, then how does
it? I cannot seem to figure this out.

simulate_span(latitude_deg, longitude_deg, horizon, start_datetime,
end_datetime, step_minutes, elevation = 0, temperature =
constants.standard_temperature, pressure = constants.standard_pressure)

Regards,
Ryan