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

they have given their times in a śaka, but that is calculated in śaka started in 78 AD long after their death by Śālivāhana, grandson of Vikramāditya. He has indicated in Bṛhat-saṁhitā (13/3) that he was using a śaka of 612 BC (Yudhiṣṭhira śaka 2526). In same Yudhiṣṭhira śaka of 3138 BC, he has given his date of birth as 8-3-95 BC (śaka, 3042, Chaitra śukla 8) in Kutūhala-mañjarī- वराहमिहिर-कुतूहल मञ्जरी-स्वस्ति श्रीनृप सूर्यसूनुज-शके याते द्वि-वेदा-म्बर-त्रै (३०४२) मानाब्दमिते त्वनेहसि जये वर्षे वसन्तादिके। चैत्रे श्वेतदले शुभे वसुतिथावादित्यदासाद्भूद् वेदाङ्गे निपुणे वराहमिहिरो विप्रो रवेराशीर्भिः॥ वराहमिहिर-बृहत् संहिता (१३/३)- आसन् मघासु मुनयः शासति पृथ्वीं युधिष्ठिरे नृपतौ। षड्-द्विक-पञ्च-द्वि (२५२६) युतः शककालस्तस्य राज्ञस्य॥ He has indicated his birth in Kapitthaka and later life at Avantikā, then under Vikramāditya- वराहमिहिर-बृहज्जातक, अध्याय २८-उपसंहार- आदित्यदास तनयस्तदवाप्त बोधः कापित्थके सवितृलब्धवरप्रसादः। आवन्तिको मुनिमतानवलोक्य सम्यग् घोरां वराहमिहिरो रुचिरां चकार॥९॥ He has indicated start of north motion of sun from Makara sign in Bṛhat-saṁhitā and equivalent yoga calculation in Pañcha-siddhāntikā वराहमिहिर-बृहत् संहिता (३/१-२)-आश्लेषार्द्धाद्दक्षिणमुत्तरमयनं रवेर्धनिष्ठाद्यम्। नूनं कदाचिदासीद्येनोक्तं पूर्वशास्त्रेषु॥१॥ साम्प्रतमयनं सवितुः कर्कटकाद्यं मृगादितश्चान्यत्। उक्ताभावो विकृतिः प्रत्यक्षपरीक्षणैर्व्यक्तिः॥२॥ = Earlier books stated south motion of sun from middle of Āśleṣā (113⁰20’) and north motion from start of Dhaniṣṭhā. Now, it is from start of Karka (90⁰) and Makara (270⁰) signs, which can be easily verified by observa- tion. पञ्चसिद्धान्तिका, अध्याय ३ (पौलिश सिद्धान्त)- अर्केन्दुयोगचक्रे वैधृतमुक्तं दशर्के सहिते (तु)। यदि च(क्रं) व्यतिपातो वेला मृग्या (युतैः भोगैः॥२०॥ आश्लेषार्धार्दासीद्यदा निवृत्तिः किलोष्णकिरणस्य। युक्तमयनं तदाऽऽसीत् साम्प्रतमयनं पुनर्वसुतः॥२१॥ When sum of sun and moon sign/degrees is 360⁰, then it is Vaidhṛti yoga-when declination of sun and moon are same but in opposite directions (north-south). Adding 10 nakṣatras (133⁰20’), it is Vyatīpāta yoga, when sun-moon have same declination, but on opposite ends of ecliptic. That is possible only when south motion of sun started from middle of Āśleṣā (113⁰20’) which now starts from Punarvasu (Karka sign starts with its fourth quarter, 90⁰). In his book Pañcha-siddhāntikā, he has taken reference year as 427 śaka (185 BC)- पञ्चसिद्धान्तिका, अध्याय १- सप्ताश्विवेद (४२७) संख्यं शककालमपास्य चैत्रशुक्लादौ। अर्धास्तमिते भानौ यवनपुरे सौम्य दिवसाद्यः॥८॥ = On Śaka 427, Chaitra śukla 1 start when sun was half set at Yavanapur, it was day of Saumya (mercury, sun of Soma = moon). Thebaut has changed Saumya to Soma (Monday). S.B. Dixit made it Bhauma =Tuesday, so that it tallies with counting from Śālivāhana-śaka starting after death of Varāhamihira in 78 AD. Yavanapura is assumed to be Romaka-pattana of Sūrya-siddhānta, 90⁰ west from Ujjain. Sun is set from evening to sunrise, its middle point is midnight. When it is midnight there, it will be sunrise in Ujjain. This Śaka started in year 2526 of Yudhiṣṭhira Śaka. वराहमिहिर-बृहत् संहिता (१३/३)-