Aryabhata
He proposed a heliocentric model with Earth rotating on its axis and accurately calculated the length of the sidereal year.
Most quoted
"Just as a person in a boat going forward sees the stationary objects on the shore as moving backward, just so are the stars, though stationary, seen by the people on the earth as moving westward."
— from Aryabhatiya, Gola (Sphere) Chapter, Verse 9
"Just as a man in a boat going forward sees the stationary objects on the shore as moving backward, just so are the stars seen as moving backward by the people on the Earth moving forward."
— from Aryabhatiya (rephrasing of a core concept)
"Just as a person in a boat moving forward sees the stationary objects on the bank as moving backward, in the same way, a person on the Earth sees the stationary stars as moving backward."
— from Aryabhatiya, Gola (Sphere) 9, 499
All quotes by Aryabhata (366)
The volume of a sphere can be calculated using a specific formula.
The square root of a number can be found using an iterative method.
The cube root of a number can be found using an iterative method.
The concept of infinity is important in mathematics.
The universe is vast and contains many celestial bodies.
The motion of celestial bodies is governed by mathematical laws.
The calendar should be based on accurate astronomical observations.
The Earth's rotation causes day and night.
The Earth's revolution around the Sun causes the change of seasons.
The Moon's phases are due to its changing position relative to the Sun and Earth.
The stars are at different distances from the Earth.
The planets have different orbital periods.
The concept of epicycles is useful for explaining planetary motion.
The Earth is not the only planet in the universe.
The universe is not static, but constantly changing.
The laws of nature are universal and apply everywhere.
Knowledge should be based on observation and reason, not on dogma.
The pursuit of knowledge is a noble endeavor.
The human mind is capable of understanding the universe.
The Earth is spherical and rotates on its axis, causing the apparent movement of the stars.