Sripati 

Born: 1019 in (probably)
Rohinikhanda, Maharashtra, India Died: 1066 in India
Sripati's father was Nagadeva (sometimes written as Namadeva) and
Nagadeva's father, Sripati's paternal grandfather, was Kesava.
Sripati was a follower of the teaching of Lalla writing on astrology,
astronomy and mathematics. His mathematical work was undertaken with
applications to astronomy in mind, for example a study of spheres.
His work on astronomy was undertaken to provide a basis for his
astrology. Sripati was the most prominent Indian mathematicians of
the 11th Century. Among Sripati's works are: Dhikotidakarana
written in 1039, a work of twenty verses on solar and lunar eclipses;
Dhruvamanasa written in 1056, a work of 105 verses on calculating
planetary longitudes, eclipses and planetary transits;
Siddhantasekhara a major work on astronomy in 19 chapters; and
Ganitatilaka an incomplete arithmetical treatise in 125 verses based
on a work by Sridhara. The titles of Chapters 13, 14, and 15
of the Siddhantasekhara are Arithmetic, Algebra and On the Sphere.
Chapter 13 consists of 55 verses on arithmetic, mensuration, and
shadow reckoning. It is probable that the lost portion of the
arithmetic treatise Ganitatilaka consisted essentially of verses
1955 of this chapter. The 37 verses of Chapter 14 on algebra state
various rules of algebra without proof. These are given in verbal
form without algebraic symbols. In verses 3, 4 and 5 of this chapter
Sripati gave the rules of signs for addition, subtraction,
multiplication, division, square, square root, cube and cube root of
positive and negative quantities. His work on equations in this
chapter contains the rule for solving a quadratic equation and, more
impressively, he gives the identity: v(x + vy) = v[(x + v(x2
 y)]/2 + v[(x  v(x2  y)]/2) Other mathematics included in
Sripati's work includes, in particular, rules for the solution of
simultaneous indeterminate equations of the first degree that are
similar to those given by Brahmagupta Sripati obtained more
fame in astrology than in other areas and it is fair to say that he
considered this to be his most important contributions. He wrote the
Jyotisaratnamala which was an astrology text in twenty chapters based
on the Jyotisaratnakosa of Lalla. Sripati wrote a commentary on this
work in Marathi and it is one of the oldest works to have survived
that is written in that language. Marathi is the oldest of the
regional languages in IndoAryan, dating from about 1000.
Another work on astrology written by Sripati is the Jatakapaddhati or
Sripatipaddhati which is in eight chapters and is [1]: ...
one of the fundamental textbooks for later Indian genethlialogy,
contributing an impressive elaboration to the computation of the
strengths of the planets and astrological places. It was enormously
popular, as the large number of manuscripts, commentaries, and
imitations attests. Genethlialogy was the science of casting
nativities and it was the earliest branch of astrology which claimed
to be able to predict the course of a person's life based on the
positions of the planets and of the signs of the zodiac at the moment
the person was born or conceived. There is one other work on
astrology the Daivajnavallabha which some historians claim was
written by Sripati while other claim that it is the work of
Varahamihira. As yet nobody has come up with a definite case to show
which of these two is the author, or even whether the author is
another astrologer. Article by: J J O'Connor and E F
Robertson Source:
www.history.mcs.standrews.ac.uk/Mathematicians



