How did Alberuni measure the circumference of the earth?

English: Biruni (973 – 1048) developed a new method using trigonometric calculations to compute earth’s radius and circumference based on the angle between the horizontal line and true horizon from a mountain top with known height.

Who calculated the radius of the earth?

Eratosthenes
240 B.C. Eratosthenes Measures the Earth. By around 500 B.C., most ancient Greeks believed that Earth was round, not flat. But they had no idea how big the planet is until about 240 B.C., when Eratosthenes devised a clever method of estimating its circumference.

Was written by Al Biruni?

Kitab al-Tafhim is the book authored by Al-Biruni in both Persian and Arabic languages. He traveled to the Indian subcontinent in 1017. Tārīkh al-Hind (History of India) is a book authored by Al-Biruni based on his study of Indian culture.

How did the Muslims calculate the circumference of the earth?

To do this accurately they needed to know the curvature of the earth and knowing this demanded that they know the size of the earth. They started by finding the distance over which the sun’s angle at noon changed by 1 degree, multiply it by 360 and you arrive at the circumference from which size can be deduced.

What is the distance around the Earth in miles?

24,901 mi
Earth/Circumference

Using those measurements, the equatorial circumference of Earth is about 24,901 miles (40,075 km). However, from pole to pole — the meridional circumference — Earth is only 24,860 miles (40,008 km) around.

How did Eratosthenes know the Earth was round?

Eratosthenes erected a pole in Alexandria, and on the summer solstice he observed that it cast a shadow, proving that the Sun was not directly overhead but slightly south. Recognizing the curvature of the Earth and knowing the distance between the two cities enabled Eratosthenes to calculate the planet’s circumference.

Was Al-Biruni a Traveller?

Abū Rayhān Al-Bīrūnī, better known simply as Al-Biruni, was an Iranian scholar and Polymath. He lived during the Islamic Golden age (8th to 14th century). He travelled to the Indian subcontinent in 1017.

What is the meaning of Al-Biruni?

Abu Rayhan al-Biruni /ælbɪˈruːni/ (973 – after 1050) was an Iranian scholar and polymath during the Islamic Golden Age. In 1017 he travelled to the Indian subcontinent and wrote a treatise on Indian culture entitled Tārīkh al-Hind (History of India), after exploring the Hindu faith practiced in India.

What Al Biruni wrote about India?

In 1017 he traveled to the Indian subcontinent. He travelled extensively in various parts of the country, studied the language, religion and philosophy of the Hindus and wrote the classic account of the country and its people in Arabic, entitled Tarikh-ul Hind.

What is the language of Kitab ul Hind?

Arabic language
Al – Beruni. Hint:Kitab – ul – Hind is written on beliefs, customs and about the society. Most of the work of this book is written in Arabic language.