सिद्धान्तदर्पण (महामहोपाध्याय सामन्त चन्द्रशेखर सिंह - नग्न-नेत्र खगोल वेध एवं गणित महाकोश)

Introduction¹
In his Brihat Samhita, Varaha-mihira
enumerates the requisite qualifications of an
astronomer. According to him, an astronmer should
be able to explain the differences in the various
Siddhantas, to demonstrate with the help of
instruments the moment of the Sun's turning to the
north or to the south, and of his entering the prime
vertical and the meridian, and to make calculation
agree with observation.
Unfortunately, the true science of astronomy
has been ousted by the pseudo-science of astrology,
whose votaries are to be found in almost every town

1. Tycho Brahe (1546-1601 A.D.), a Dane, born at
   Knudsthrop, near the Baltic, three years after Copernicus
   (1473-1543 A.D.) teminated his career. The fame of Tycho
   has been obscured by his rejection of the Copernican
   doctrine, and the construction of a system of his own,
   combining the elements of the Ptolemaic and Copernican
   theories. He maintained the earth to be the immovable
   centre of the universe, but supposed the planets to revolve
   round the Sun, and to be carried with their centre in
   revolution round the earth. Samanta Chandrasekhar,
   contrary to Tycho's university education royal favour, was
   conserevative and well versed in Hindu - Astronomy by
   the study of Siddhantas without any royal patronage and
   was far from modern education even in 19th century i.e.
   300 years after Tycho. But strangely enough
   Chandrasekhar adopts the planets' orbit as conceived by
   Tycho, who was usually deemed discreditable in those
   days for his hypothesis. Despite this late Prof. Jogesh Ch.
   Roy, an admirer of Chandrasekhar, however finds
   pleasure in comparing with Tycho.