# A statistical approach to latitude measurements: Ptolemy's and Riccioli's geographical works as case studies

@article{Santoro2017ASA, title={A statistical approach to latitude measurements: Ptolemy's and Riccioli's geographical works as case studies}, author={Luca Santoro}, journal={History of Geo- and Space Sciences}, year={2017}, volume={8}, pages={69-77} }

Abstract. The aim of this work is to analyze latitude measurements typically used in historical geographical works through a statistical approach. We use two sets of different age as case studies: Ptolemy's Geography and Riccioli's work on geography. A statistical approach to historical latitude and longitude databases can reveal systematic errors in geographical georeferencing processes. On the other hand, once exploiting the right statistical analysis, this approach can also lead to new…

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## References

SHOWING 1-10 OF 38 REFERENCES

### Rectification of the ancient geographic coordinates in Ptolemy's Geographike Hyphegesis

- Physics
- 2012

Abstract. A multitude of the ancient places given by Ptolemy in his Geography (~150 AD) are so far unknown. One of the main problems of their identification are the errors of the given ancient…

### Rectification of position data of Scotland in Ptolemy’s Geographike Hyphegesis

- Geography
- 2014

Abstract The ancient geographic coordinates given for places of Great Britain in Ptolemy’s Geographike Hyphegesis are investigated by means of geodetic methods. The turning of Scotland to the east is…

### Spatial distribution of Ptolemy's Geographia coordinate differences in North Mediterranean eliminating systematic effects

- Physics
- 2009

Summary Claudius Ptolemy, in his Geographia describes geographic sites (i.e. towns, mountain picks, river mouths, promontories and other) as points with given coordinates of spherical longitude and…

### Ptolemy’s longitudes and Eratosthenes’ measurement of the earth’s circumference

- Physics
- 2013

A statistical analysis of the longitudes reported in Ptolemy's Geographia shows that many of them were obtained by distorting in a linear way data which were known with good accuracy. As a…

### On the precision of Ptolemy's geographic coordinates in his Geographike Hyphegesis

- Physics
- 2011

Abstract. In his Geographike Hyphegesis (~150 AD) Claudius Ptolemy catalogued the positions of over 6300 ancient locations in the form of geographic longitude and latitude. A determination of the…

### Higher order systematic effect in Ptolemy's Geographia coordinate description of Iberia

- Physics
- 2009

Summary Claudius Ptolemy, in his Geographia describes geographic sites (i.e. towns, mountain picks, river mouths, promontories and other) as points with given coordinates of spherical longitude and…

### Investigations of the coordinates in Ptolemy’s Geographike Hyphegesis Book 8

- Physics
- 2012

In Book 8 of his Geographike Hyphegesis Ptolemy gives coordinates for ca. 360 so-called noteworthy cities. These coordinates are the time difference to Alexandria, the length of the longest day, and…

### Eratosthenes’ Parallel of Rhodes and the History of the System of Climata

- Environmental Science
- 2006

Ptolemy was the first to use the so-called system of seven climata (Almagest 2.12 Heiberg I 172—187) which, due to his authority, was later to become one of the canonical elements of late antique,…

### The Two Major Megalithic Observatories in Scotland

- Physics
- 1984

The methods given in this paper are as complete as we know how to make them. Many of the points are explained more fully in the references cited, and so these references must be used by the reader…

### Eratosthenes, Hipparchus, and the Obliquity of the Ecliptic

- Physics
- 2002

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…