ततश्चअथाद्यास्तिथयः सर्वाः स्वरा बिन्द्ववसानकाः ।तदन्तः कालयोगेन सोमसूर्यौ प्रकीर्तितौ ॥ ५ ॥
In plain words
And then: Now the tithis, all of them, beginning with a, are the vowels that end with bindu; at their end, by the joining of time, the moon and the sun are declared.