Astrolabes were used to know the position of stars and also calculate time in more recent years. Siddhanta Shiromani by Bhaskaracharya II extensively describes the construction of yantras for various purposes. The construction of Gola (Sidd. Shir. Yant. 3 and 4) and Ghati Yantras are given in Siddhanta Shiromani in the following sloka as an example<blockquote>घटदलरूपा घटिता घटिका ताम्री तले पृथुच्छिद्रा। द्युनिशनिमज्जनमित्या भक्तं द्युनिशं घटीमानम्॥ सि. शि. यन्त्र.८ (Sidd. Shir. Yant. 8)</blockquote>
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Astrolabes were used to know the position of stars and also calculate time in more recent years. Siddhanta Shiromani by Bhaskaracharya II extensively describes the construction of yantras for various purposes. The construction of Gola (Sidd. Shir. Yant. 3 and 4) and Ghati Yantras are given in Siddhanta Shiromani in the following sloka as an example<blockquote>घटदलरूपा घटिता घटिका ताम्री तले पृथुच्छिद्रा। द्युनिशनिमज्जनमित्या भक्तं द्युनिशं घटीमानम्॥ सि. शि. यन्त्र.८ (Sidd. Shir. Yant. 8)</blockquote><blockquote>ghaṭadalarūpā ghaṭitā ghaṭikā tāmrī tale pr̥thucchidrā। dyuniśanimajjanamityā bhaktaṁ dyuniśaṁ ghaṭīmānam॥ si. śi. yantra.8 (Sidd. Shir. Yant. 8)</blockquote>