Brihat Samhita
संख्याविधानात्प्रतिदेशं अस्य विज्ञाय सन्दर्शनं आदिशेज्ज्ञः । तच्च उज्जयिन्याम् अगतस्य कन्यां भागैः स्वराख्यैः स्फुटभास्करस्य ॥ १२-१४ ॥
The time of reappearance of the star Canopus (Agastya) is different in different places; and it is for the learned astronomer to ascertain these times for given places. In the town of Ujjain, the star reappears when the sun just begins to enter the 24th degree of the sign Leo.
english translation
saMkhyAvidhAnAtpratidezaM asya vijJAya sandarzanaM AdizejjJaH । tacca ujjayinyAm agatasya kanyAM bhAgaiH svarAkhyaiH sphuTabhAskarasya ॥ 12-14 ॥
hk transliteration by Sanscript