In the chandas (Vedas), the word varṣā takes the affix ṭhañ , in the remaining senses.,
This debars ठक्. The form will be the same, but there will be difference in accent. As नभश्च नभस्यश्च वार्षिकावृतू ॥ The word ऋतु here means \month,\ i. e. Nabha and Navasya are two rainy months.,