Convergence articles

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Images from <em>De revolutionibus,</em> the book of Nicolaus Copernicus in which he presented his heliocentric theory, arguing that the planets, including the Earth, rotated about the Sun

Collection (from 1614) of Roger Bacon's 13th century writings on applications of mathematics

A merchant gave a university 2,814 ducats on the understanding that he was to be paid back 618 ducats per year for 9 years, at the end of which the 2,814 ducats should be considered as paid.
Two travelers, starting at the same time from the same point, travel in opposite directions round a circular railway.
Wanting to know the breadth of a river, I measured a base of 500 yards in a straight line close by one side of it.
In baking a hemispherical loaf of bread of 10" radius, the crust was everywhere of an equal thickness, and the solidity of the crust was equal to half the solid content of the whole loaf. What were the dimensions of the interior soft part?

A detailed study of the cycles of the Mayan calendar, along with some other ancient calendars.

There is a lion in a well whose depth is 50 palms. He climbs and slips back a certain amount each day. In how many days will he get out of the well?
Show that the curves x2 - y2 = a2 and 2 xy = b2 cross at right angles.
One says that 10 garments were purchased by two men at a price of 72 dirhams. The garments varied in value. The price of each garment of one man is 3 dirhams more than the price for each garment of the other. How many garments did each man buy?