The contrast between Mars' hemispheric seasons would be much more extreme During northern hemisphere summer, the sun would be visible in the sky ~all day long During summer at Mars' south pole, the angle of incoming sunlight would be practically vertical.
(the angle of incoming sunlight; would be; practically vertical; T:During summer at Mars' south pole) (the sun; would be; visible; T:in the sky ~all day long) Context(the sun would be,List([109, 125))):(The contrast between Mars' hemispheric seasons; would be; much more extreme; T:During northern hemisphere summer)
the sun would be,List([109, 125))
the angle of incoming sunlight the sun The contrast between Mars' hemispheric seasons
would be would be would be
practically vertical T:During summer at Mars' south pole
visible T:in the sky ~all day long
much more extreme T:During northern hemisphere summer