पञ्चसिद्धान्तिका (आचार्य वराहमिहिर - सूर्य, रोमक, पौलिश, वासिष्ठ एवं पितामह सिद्धान्त)

XV.27 XV. SECRETS OF ASTRONOMY 289 मध्याह्नं भ(द्राश्वेऽ)स्तमयं कुरुष्व्[त्तरेषु] केतुमालानाम् । कुरुतेऽर्धरात्रमुद्य(न् भा)रतवर्षे युगपदर्कः ॥२२॥ उदयो यो लङ्कायां सोऽस्तमयः सवितुरेव सिद्धपुरे । मध्याह्नो यमकोट्यां रोमकविषयेऽर्धरात्रः सः ॥ २३ ॥ अधिमासकोनरात्रग्रहदिनतिथिविसमेषचन्द्रार्काः । अयन(र्त्वा)र्क्षगतिनिशाः समं प्रवृत्ता युगस्यादौ ॥ २४ ॥ अन्यद् रोमकविषयाद् देशान्तरमन्यदेव यवनपुरात् । लङ्कार्धरात्रसमयादन्यत् सूर्योदयाच्चैव ॥ २५ ॥ सूर्यस्यार्धास्तमयात् प्रतिदिवसं यदि दिनाधिपं ब्रूमः । तत्राऽपि नाऽऽप्तवाक्यं न (वा) युक्तिः काचिदन्याऽस्ति ॥ २६ ॥ सन्ध्या क्वचित् क्वचिदहः क्वचिन्निंशा [दिवसपतेः] क्वचित् क्वचित् । स्वल्पे स्वल्पे स्था(ने) व्याकुलमेवं दिनपतित्वम् ॥ २७ ॥ Day-reckoning 19. Siṃhācārya has declared that reckoning day-total commences at a sun- rise in Laṅkā. The preceptor of the Yavanas has said that the day commences for the Yavanas ten muhūrtas, or twenty nāḍikās, in the night, (i.e. after sun- set). Hindu siddhāntas suppose Laṅkā to be on the equator, at the junction of the Ujjain meridian. Siṃhācārya's view is that of many later siddhāntas. The preceptor of the Yavanas mentioned is probably the Yavanācārya of the Yāvanajātaka, the well-known astrological work. There is a section devoted to astronomy also in that work. If the people in Greece are meant by Yavanas here, Yavanācārya perhaps tries to fit a Greek astronomical work into serviceability in Ujjain, for 20 nāḍīs after sun-set in Greece is the moment of sun-rise at Ujjain, assuming a rough longitude correction 10 nāḍīs. 20. Āryabhaṭa has said that the day commences at mid-night at Laṅkā. He himself again has said, the day commences from sunrise at Laṅkā. Āryabhaṭa has written two works. One is the wellknown Āryabhaṭīya. He has written another work, not extant now. It is referred to by others as the Midnight School and commences the day at midnight. Bhāskara I has given its system in chap VII of his Karmanibandha, better known as Mahābhāskarīya. The system given in this is the same as that of the Saurasiddhānta of the PS. Brahmagupta professes to follow this in his Khaṇḍakhāyaka. 20a. Jy, N. समयात् 19c. B. यवनानांशिनिशिभिर्गतैर्मु॰ 20. Quoted by Nīlakaṇṭha in his b. B1.3. प्रवृत्तिञ्-गाद; B2. प्रवृत्तिः जगाद A.D.U. ॰द्शभिर्गतैर्मु॰; Jyotirmīmāṃsā, p.8, as also on A. चार्यमट्टः; B1.3. चार्यभटः M. यवना निशीह दश॰ ABh. Kāla. 16. c. M, N, U. चार्कोदयात्