Declension table of ?gaganastha

Neuter	Singular	Dual	Plural
Nominative	gaganastham	gaganasthe	gaganasthāni
Vocative	gaganastha	gaganasthe	gaganasthāni
Accusative	gaganastham	gaganasthe	gaganasthāni
Instrumental	gaganasthena	gaganasthābhyām	gaganasthaiḥ
Dative	gaganasthāya	gaganasthābhyām	gaganasthebhyaḥ
Ablative	gaganasthāt	gaganasthābhyām	gaganasthebhyaḥ
Genitive	gaganasthasya	gaganasthayoḥ	gaganasthānām
Locative	gaganasthe	gaganasthayoḥ	gaganastheṣu

Compound gaganastha -

Adverb -gaganastham -gaganasthāt