Vaisesika Sūtra 7.1.17

एतेन दीर्घत्वह्रस्वत्वे व्याख्याते ॥१७॥

etena dīrghatva-hrasvatve vyākhyāte ॥17॥

[एतेन (etena) - by this; दीर्घत्व (dīrghatva) - length; ह्रस्वत्वे (hrasvatve) - and shortness; व्याख्याते (vyākhyāte) - are explained;]

By this, length and shortness are explained.