Passage in Seal Script - 18th C Japanese Book of Chinese Poems (Poem identified: 唐・賈至《西亭春望》) I recently got an old Japanese Orihon (folding book) which has a lengthy passage in seal script - my assumption was that Japanese seal script would be the same as Chinese seal script, but if I'm wrong about that please correct me!
I managed to translate one title (not pictured) within the book as '將進酒', so given that the book contains a Li Bai poem I'm assuming it may be a collection of Chinese poems.

I know that these things are very hard to translate, so if anyone is able to do it I am very thankful in advance. I don't necessarily need the whole thing translated into English too; just if someone could let me know roughly what it is (e.g a poem, a story, a description etc.).

Thanks,
Thomas.
In modern script:

唐　賈至　《西亭春望》
日長風暖柳青青　北雁歸飛人窅冥
岳陽城上聞吹笛　能使春心滿洞庭

With the character variants inserted in their place: