cosine

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16 09, 2017

West Asian mathematics – history of math

By |2019-09-04T05:49:16-07:00September 16th, 2017|West Asia|0 Comments

History of math: Sumerian multiplication table (2700 BC) Cuneiform multiplication table Once people in West Asia figured out how to write down numbers, about 3500 BC, they quickly began to want to use cuneiform to write down other mathematical ideas. (Read more about the invention of numbers) The earliest example of this that we have is from about 2700 BC. It [...]

29 07, 2017

Tangents – trigonometry – math

By |2018-04-11T09:30:18-07:00July 29th, 2017|Math|0 Comments

Tangents: This line is tangent to a circle. What is a tangent? A tangent, like a sine or a cosine, is a mathematical way of thinking about a kind of movement that happens in nature. A tangent is really just a rephrasing of the same information we already had for calculating the sine function. Lines and circles [...]

29 07, 2017

Cosine – Trigonometry – Math

By |2019-04-26T10:01:02-07:00July 29th, 2017|Math|0 Comments

Right triangle and cosine What is a cosine? A cosine, like a sine, is a mathematical way of thinking about a kind of movement that happens in nature. A cosine is really just a rephrasing of the same information we already had for calculating the sine function. What's a sine? More trigonometry History of astronomy [...]

22 07, 2017

Invention of Zero – Indian Numbers

By |2019-09-18T13:58:43-07:00July 22nd, 2017|India|2 Comments

History of Math: Counting tokens from Mehrgarh in Late Stone Age India Indian counting tokens and base 10 The first Indian numbers appeared in the late Stone Age, about 4000 BC. Around this time, people at Mehrgarh began to use counting tokens. (People were already using these tokens in West Asia.) Where was Mehrgahr? Indian history articles Writing [...]

18 07, 2017

Who was Hipparchus? Greek astronomy

By |2019-08-15T17:58:13-07:00July 18th, 2017|Greeks, History, Science|0 Comments

Antikythera mechanism: a clockwork machine to calculate how the earth and the sun move around When did Hipparchus live? Hipparchus was a Greek astronomer and mathematician in the 100s BC, in the time of the first big empires. He used trigonometry to calculate how far away the moon was from the earth. Greek astronomy Greek math - geometry History of [...]