Declension table of ?dīrghasandhya

Neuter	Singular	Dual	Plural
Nominative	dīrghasandhyam	dīrghasandhye	dīrghasandhyāni
Vocative	dīrghasandhya	dīrghasandhye	dīrghasandhyāni
Accusative	dīrghasandhyam	dīrghasandhye	dīrghasandhyāni
Instrumental	dīrghasandhyena	dīrghasandhyābhyām	dīrghasandhyaiḥ
Dative	dīrghasandhyāya	dīrghasandhyābhyām	dīrghasandhyebhyaḥ
Ablative	dīrghasandhyāt	dīrghasandhyābhyām	dīrghasandhyebhyaḥ
Genitive	dīrghasandhyasya	dīrghasandhyayoḥ	dīrghasandhyānām
Locative	dīrghasandhye	dīrghasandhyayoḥ	dīrghasandhyeṣu

Compound dīrghasandhya -

Adverb -dīrghasandhyam -dīrghasandhyāt