Brihat Samhita
शातकुम्भसदृशः स्फटिकाभस्तर्पयन्निव महीं किरणाग्रैः । दृश्यते यदि तदा प्रचुरान्ना भूर्भवत्यभयरोगजनऽढ्या ॥ १२-२० ॥
If Canopus (Agastya) should appear of the colour of silver or crystal, or brilliant, there will be prosperity in the land and mankind will be free from fear and disease.
english translation
zAtakumbhasadRzaH sphaTikAbhastarpayanniva mahIM kiraNAgraiH । dRzyate yadi tadA pracurAnnA bhUrbhavatyabhayarogajana'DhyA ॥ 12-20 ॥
hk transliteration by Sanscript