Claudius Ptolemy was a Greek mathematician, astronomer and geographer who lived in the Egyptian city of Alexandria while under the rule of the Roman Empire. Much of medieval astronomy and ...

IT is somewhat strange that in the article on Ptolemy in the “Penny Cyclopædia,” he is spoken of only as a geographer. His fame is undoubtedly built upon his two great works on astronomy and ...

Ptolemy’s Geography, 150 A.D. Often referred to as the ... Ask electrical draftsman Harry Beck, who stripped down the sprawling Tube network into a neat diagram of easy-to-read colors and ...

Stem and leaf diagrams make it easier to read lists of number Stem and leaf diagrams are formed by splitting the number into two parts, the ‘stem’ and the ‘leaf. For example: In the number ...

These drawings, which first appeared in the journal Advances in Protein Chemistry in 1981, became known as ribbon diagrams. Richardson’s drawing style was quickly adopted. Structural biologists ...

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While we wouldn’t want to document a computer motherboard with ASCII schematics, it’s great for a quick-and-dirty circuit diagrams. Not exactly schematics, but [Duckman] has some Arduino ...

In effect, he noticed that where the Arabic diagram has a geometric point designated with the ... for the planetary positions just as well as Copernicus could do, or even Ptolemy for that matter, ...

It should be easier for students to see a color diagram than to understand textual theorems like ... of the medians of a triangle divide the medians in the ration 2:1 Ptolemy's theorem relating the ...

Topics to consider include: historical astronomers—such as Nicolaus Copernicus, Claudius Ptolemy, and Johannes ... telescopes for display. Include diagrams of antique telescopes for contrast.

Inspired by professor of climate science Ed Hawkins' climate warming stripes, the air quality stripes depict particulate matter (PM) concentrations in 176 cities worldwide since 1850. These tiny ...