James Q. Jacobs
James Q. Jacobs is an American anthropologist/archaeologist, who, to the best of my knowledge, has not ventured into the choppy waters of atlantology. However, he has commented on many peripheral subjects covered in Atlantipedia.
He rationalised the incredible time spans found in ancient Indian literature, by suggesting that the numbers referred to related to days rather than years(a). He has also written extensively on archaeology(b). His website(c) has many articles devoted to pre-Columbian America, both North and South.
Geodesy is another of his interests about which he has written a useful introduction(d).
Geodesy is usually defined as the measurement and mapping of the Earth.>James R. Smith, the author of Introduction to Geodesy  has conflated several definitions to produce “Geodesy, from the Greek, literally means dividing the earth, and as a first objective, the practice of geodesy should provide an accurate framework for the control of national topographical surveys. Thus geodesy is the science that determines the figure of the earth and the interrelation of selected points on its surface by either direct or indirect techniques. These characteristics further make it a branch of applied mathematics, one that must include observations that can be used to determine the size and shape of the earth and the definition of coordinate systems for threedimensional positioning; the variation of phenomena near to or on the surface, such as gravity, tides, earth rotation, crustal movement, and deflection of the plumb line; together with units of measurement and methods of representing the curved earth surface on a flat sheet of paper.”<
>Geodesy as a science can be traced back to Pythagoras (6th cent. BC), who was thought to be the first to propose the sphericity of the Earth. Aristotle & Archimedes were apparently the first the offer a figure for the diameter of the Earth, suggesting 400,000 and 300,000 stades respectively. The difference might be partly explained by the use of a different length of stade.<
Later, Eratosthenes (276 BC– 195 BC) offered another early attempt to determine the dimensions of our Earth and succeeded with remarkable accuracy.
A controversial aspect of modern geodesy is the claim that many ancient sites were deliberately established at locations that had a specific geodetic relationship to each other and/or the dimensions of the Earth. For example(a) in ancient Egypt, from Giza to the Equator is 1/12th the circumference of the Earth, Amarna to the Equator is 1/13th, Luxor 1/14th and Philae 1/15th! Graham Hancock in his Heaven’s Mirror pointed to similar relationships around the globe suggesting a possible world grid. This idea of a world grid has a number of supporters but is often classified as a ‘fringe’ interest due to the attempt by some to link gridlines with UFOs and their use of the grid as a power source(w).
Possibly related features may be the ley lines identified by Alfred Watkins in Britain(c)(g), the Alesia alignments in France discovered by Xavier Guichard(b) and/or the Heilige Linien of Germany claimed by Wilhelm Teudt(aa).
Heinz Kaminski claimed to have discovered a megalithic grid system that stretched from Stonehenge across Europe with an east-west and north-south orientation and referred to as the Stonehenge/Wormbach System(h).
Even more exotic is the ancient Raetiastone navigation system rediscovered by Gerhard Pirchl (1942-2013) and outlined in a book by  Thomas Walli(ae).
Ashley Cowie has published a paper(ac) related to Alesia and the work of Guichard and others, as well as his own investigations.
I should also point out that Marcel Mestdagh also identified a form of a road system, laid out in giant ovals with radials in France. At the centre of these ovals was the ancient city of Sens. Philip Coppens informs us [1275.184] that a further strange discovery by Mestdagh was that this ancient road network, centred on Sens, was mirrored by a similar network of roads in England centred on Nottingham!
‘The Way of Virachoca’ in the Andes which runs through Tiwanaku and is oriented exactly 45° west of true north and runs for over 1000 miles, has been studied by Maria Scholten d’Ebneth  in the 1970s and expanded on by a number of Spanish speaking commentators and is now the subject of an article by Dave Truman(x).
In 1973, three Russians, engineers Valery Makarov and Vyacheslav Morozov along with Nikolay Goncharov, an artist, published in Russian an article with the eye-catching title of Is the Earth a Giant Crystal? (y) This was probably the earliest presentation of an earth grid based on ancient historical sites. A brief history of the earth grid theories that emerged around this time is available online(z). There is now a Russian geodesy website with an English translation(ab).
David Hatcher Childress published his Anti-Gravity and the World Grid  in 1993, with the modest claim that he “proves that the earth is surrounded by an intricate electronic grid network offering free energy.” Obviously, Childress’ understanding of ‘proof’ is different to mine, as the only proof required is the production of some of this free energy, which he has not done.
Tom Brooks entered the fray with a study of 1500 prehistoric sites and his conclusion that the inhabitants of ancient Britain had designed a navigation system based on a grid of isosceles triangles(i). Brooks has gone a step further and speculatively claimed that the accuracy of this geometry-based system could only have been designed through “extraterrestrial intervention”(r). This concept is explored more fully in his latest book, Seeing Around Corners: Geometry in Stone Age Britain  and in a series of video clips(s). A more critical view of Brooks’ ideas is also available on the Internet(j).
Some years ago a former employee of a NASA sub-contractor, Maurice Chatelain claimed that within a 450-mile radius of the Aegean island of Delos that 13 mystical sites, when connected by straight lines formed a perfect Maltese Cross(u)!
Others such as Livio Stecchini(d) and Jim Alison(e) using geodetic calculations have identified São Tomé and Cape Verde respectively as the location of Atlantis. I must also include Hugo Kennes, a Belgian researcher with a passionate interest in global grids and sacred geometry(l). Kennes has also informed me of a new Facebook group(q) dealing with all aspects of the subject, as well as another(v) that includes submerged cities and other features.
Anyone interested in pursuing a study of this subject might like to look over James Q. Jacobs’ archaeogeodesy website(f) as well as the BioGeometry website (m).
If you have pursued all the links so far, you can pamper yourself further with a paper(k) by William Becker and Beth Hagens(n). Another researcher in this field is Dan Shaw whose website(o) gives a good overview of the subject.
Jean-Pierre Lacroix added his weight to the debate with his 1998 paper entitled The Mapmakers from the Ice Age(t).
A global network of sacred sites was also put forward by Rand Flem-Ath & Colin Wilson in The Atlantis Blueprint . This book was intended as a sequel to When the Sky Fell , but generally wandered off into other areas after the first couple of chapters.
I am somewhat sceptical about certain aspects of geodesy, particularly some of the claims of a world grid. However, it does raise many questions that require further study and explanation. In this connection, I would recommend John Sase’s Curious Alignments  as a good starting point. He confirms the work of Guichard and also offers a range of his own discoveries in the Great Lakes region.
In February 2020, Frank Maglione Nicholson, Ken Phungrasamee & David Grimason, collectively known as The Nazca Group(ad), published The Nazca Great Circle Map Hypothesis. Their claim is that “The lines and geoglyphs carved into the Nazca plateau represent a map of the Earth. The map is a Great Circle Map: a gnomonic projection with the center of the Earth as its cartographic viewpoint. Each line on the Nazca Plateau represents a great circle of navigation centred at the centre of the Earth and encircling the entire planet. The majority of the lines on the Nazca Plateau radiate from five loci of origin called radial centres.” I found this rather esoteric proposition difficult to absorb.
Arturo Villamarin has published many books  and papers(af)(ag) in which the geometry and astronomy of archaeological monuments; Göbekli Tepe, Stonehenge, Teotihuacán and Mohenjo Daro, among others, are discussed.
(d) http://www.metrum.org/mapping/atlantis.htm (link broken Dec. 2020)
(r) https://www.prehistoric-geometry.co.uk/ [See (i)]
Mediterranean Sea Level. There is general acceptance that, on more than one occasion, the Strait of Gibraltar was closed completely. Tectonic plate movement, worldwide sea level drops due to the onset of Ice Age glaciation or a combination of both, could have caused this. There is also clear undisputed evidence that the Mediterranean Sea has dried out completely on a number of occasions. What is not clear is when the last desiccation or partial drying-out of the Mediterranean ended. The conventional date given for the last breaching of a Gibraltar Dam is 5 million years ago. However, there is a small but growing opinion that there was a more recent breach of a dam within the memory of modern man and preserved in history and myth.
>Not only have sea levels changed, but a 2020 report has now offered evidence that the Mediterranean was over three degrees hotter 2,000 years ago and that it remained hotter for about 500 years during the time of the Roman Empire(c).<
Where one theory on the location of Atlantis is concerned, the existence of a Gibraltar dam before the end of the last Ice Age is critical, namely that Atlantis was situated near modern Cyprus. The site chosen by author Robert Sarmast is 1650 metres beneath the present level of the Mediterranean. His theory is totally dependent on proving the existence of this dam. It would seem prudent to have carried out a more detailed study of the evidence for a relatively recent removal of the dam before engaging in a very costly exploration over a mile under the eastern Mediterranean.
There are a number of facts that appear to suggest a more recent Mediterranean inundation but even collectively they do not offer any more than circumstantial evidence.
(i) The Mediterranean sea level must have dropped by as much as from 150 to 300 meters or more. Several years ago, by chance divers found submerged entrances (below sea level) in Southern France, which subsequently led them to discover the now famous prehistoric cave paintings there. There are many man-made stone structures around the Mediterranean that are now under water as well.
Cosquer Cave, near Marseilles, has its entrance 37 metres underwater. It contains several dozen works painted between 25000-17000 BC. The opening was once several miles inland until about 10000 BC when the sea began to rise at the end of the last Ice Age. It has been estimated that that it was originally at a height of 80 metres above sea level, according to anthropologist, James Q. Jacobs(a). This cave art depicts the Auk, which had never been found this far north.
(ii) Submerged Maltese structures, although their inundation may have been caused by local seismic activity rather than global sea level changes.
(iv) A modern Guide to Provence(b) also claims a relatively recent removal of the Gibraltar land bridge.
(vi) The sunken port of ancient Syedra in Turkey.
(b) Landmark Visitors Guide – Provence & Côte D’Azure by Richard Sale. (p.16)