This paper presents a critical analysis of the accepted educational use of the method performed by Eratosthenes to measure the circumference of Earth which is often considered as a relevant means of… Expand

Almagest declinations attributed to Timocharis, Aristyllos, Hipparchus, and Ptolemy are investigated through comparisons of the reported declinations with the declinations computed from modern… Expand

Who first determined the size of the Earth? How did they do it? These fundamental questions arise in studying early Greek, Indian and Islamic mathematical astronomy. In this article we look at the… Expand

Consider the following quotation from the author of the treatise Fī sanat al-shams (“On the Solar Year”), most likely written in Baghdad in the first part of the ninth century:

Recent breakthroughs in cosmology reveal that a quarter of the Universe is composed of dark matter, but the microscopic identity of dark matter remains a deep mystery. I review recent progress in… Expand

Measurement of long distances in astronomy and geodesy has an interesting history involving the inception of several statistical concepts, such as least absolute deviations, least squares, maximum… Expand

It is well known that the precise value for the obliquity of the ecliptic that Ptolemy adopts in Almagest 1.14, namely 23°51'20", is simply the sexagesimal representation in degrees, rounded to the… Expand

It is argued that a mathematical error affects this result, which suggests that the conventional ancient chronology, instead of being compressed, may actually have to be expanded slightly.Expand

ABIR-AM, Pnina, rev. of An Imagined World, 481. Abrams, John W. (1913-1981), Eloge by Melvin Kranzberg, 422. Acloque, Paul, Oscillations et stabilite selon Foucault: Critique historique et… Expand