Bhaskara II, also known as Bhaskaracharya, is considered the 'Father of Calculus' for his significant contributions to the field in the 12th century.

Ramanujan's Approximation Theorem, also known as Ramanujan's Master Theorem, provides a method for approximating the value of a definite integral using a series expansion.

Madhava of Sangamagrama is credited with developing the 'Kerala School of Mathematics' and making significant contributions to calculus in the 15th century.

Madhava's Series Expansion, also known as the Madhava-Gregory Series, is a method for approximating the value of trigonometric functions using a series expansion.

Nilakantha Somayaji, also known as Nilakantha, made significant contributions to the field of calculus in the 16th century, including the development of the concept of 'infinite series'.

Jyeshtadeva's Area Theorem provides a method for finding the area of a circle using an infinite series.

Parameshvara, also known as Parameswaran Namboodiri, made significant contributions to the field of calculus in the 17th century, including the development of the concept of 'fluxions'.

Narayana Pandit's Series Expansion provides a method for finding the area of a circle using a series expansion.

Bhaskara I, also known as Bhaskaracharya I, made significant contributions to the field of calculus in the 18th century, including the development of the concept of 'infinitesimals'.

Brahmagupta's Area Theorem provides a method for finding the area of a triangle using Heron's formula.

Aryabhata, also known as Aryabhata I, made significant contributions to the field of calculus in the 19th century, including the development of the concept of 'differential calculus'.

Ramanujan's Integration Theorem provides a method for finding the value of a definite integral using a series expansion.

Bhaskara II, also known as Bhaskaracharya, made significant contributions to the field of calculus in the 20th century, including the development of the concept of 'integral calculus'.

Madhava's Area Theorem provides a method for finding the area of a circle using an infinite series.

Nilakantha Somayaji, also known as Nilakantha, made significant contributions to the field of calculus in the 21st century, including the development of the concept of 'calculus of variations'.