ghasaq / darkness ~ the near part of the night ?

[marie]

Peace,

I?d like to know the difference between (the near part of the night = wazulufan mina allayli in 11 114) and (the darkness of the night / the obscure part of the night = ghasaqi allayli in 17 78 )

Does the obscure part of the night / the darkness of the night = the near part of the night ?

Thanks

Marie