Hello Pamela 1! And welcome to MadridMan's ALL SPAIN Message Board!
I would imagine that the roof terrace/solarium of the
Hotel Emperador would be open, at least in September, because September is still a very hot month of the year in Madrid. Not sure about October, however. Why not send them a quick email to find out for sure? They probably have someone who responds to messages in English if you don't write in Spanish. And who knows, maybe they have some kind of rooftop terrace "event" planned for the guests of the hotel for the eclipse. Sounds interesting!
Saludos, MadridMan
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