A clear sky is also required to observe the Aurora, other factors such as the solar cycle, the phase of the moon and the time of the year all have a bearing on the probability of observing a display.
(A clear sky; to observe; the Aurora) (other factors such as the solar cycle; have; a bearing on the probability of observing a display) Context(other factors such as the solar cycle have,List([52, 146))):(A clear sky; is also required; to observe the Aurora)
other factors such as the solar cycle have,List([52, 146))
A clear sky other factors such as the solar cycle A clear sky
to observe have is also required
the Aurora
a bearing on the probability of observing a display
to observe the Aurora