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

6 PAÑCASIDDHĀNTIKĀ I.7
सममण्डलचन्द्रोदययंत्रच्छेद्यानि (शाङ्कवच्छायाः) |
उपकरणाद्यक्षज्यावलम्बकापक्रमाद्यानि ॥ ७ ॥
Contents of the Work
5-7. I shall tell in this work, avoiding all jealousy, the computation of the solar
eclipse, which is guarded as a great secret and in which the mind of the
astronomer reels. I shall also tell the occurrence or non-occurrence of the
lunar eclipse, the directions of the first and last contacts, the duration, the
total phase, the 'hypotenuse' at any moment with related quantity of obscuration
and time and also the mutual conjunctions of the stars and the planets and the
computation of differences in longitude as also the prime vertical, moonrise,
astronomical instruments and other requirements, graphical representations,
the gnomonic shadow, the sines of latitude, co-latitude and declinations and
such other matters.
The textual recording tāḍavacchāyā is emended as śāṅkavacchāyāḥ because (i) tāḍava is meaning-
less, and it may be a corruption of śāṅkava meaning relating to the śaṅku or gnomon which is
suggested by the juxtaposition with chāyā meaning 'shadow' and (ii) chāyā must be chāyāḥ because
grammer requires the accusative case of the word. TS, NP take the word as śāṅkavacchāyā, without the
final visarga.
As for the mention of the computation of the solar eclipse as a 'great secret' it is because of the
difficulty of the computation which, therefore, would bring honour to a person who can do it and for that
reason not given to all. From the contents we can see the importance of the work for religious purposes.
The technical words that occur here like prime vertical etc. will be explained in their respective
contexts.
[रोमकसिद्धान्तानुसारी अहर्गणः]
'सप्ताश्विवेद'संख्यं शककालमपास्य चैत्रशुक्लादौ |
अर्धास्तमिते भानौ यवनपुरे सोमदिवसाद्यः || ८ ||
मासीकृते समासे (द्विष्ठे) सप्ताहतेऽष्टयम (पक्षैः' ) |
लब्धैर्युतोऽधिमासैस्त्रिंशद्घ्नस्तिथियुतो द्विष्ठः || ९ ||
5a. B1. यत्तत्त्वैः; B2. यतस्त्वै 7b. B1. यन्त्र०; B2. कर्षप्र०
c. B1. मक्षर० A2. छेद्यानि
d. A1. वक्षे; B1.2. वह्नये A1. तावच्छाया; A2. B2. ताडवच्छाया;
6a. B1. दिक् संस्थिति; B2. दिक् मस्थि B1. ताष्टवच्छाया; C.D. शाङ्कवच्छाया
c. A2. ताराग्नं योगं e. B1.2. उपकरणा०
d. A1.2. सावनं D. ०ण्यान्यक्षन्या
d. B1.2. ०वलम्बपक्रमा०