This is the 982nd most frequent Russian word.
астаны
"Астаны" is the plural form of "астана," meaning "capitals" (as in capital cities) in English.
The word 'Астаны' is used in the genitive case to denote possession, indicating 'of Astana'.
Мы гуляли по улицам Астаны вечером.
We walked through the streets of Astana in the evening.
Here, 'Астаны' reflects possession and serves to describe the nighttime view of the city.
Огни ночной Астаны сияли ярко.
The lights of the night Astana shone brightly.
In this context, 'Астаны' is used in the prepositional case as part of the phrase 'о развитии Астаны' which means 'about the development of Astana'.