Evidence of the Earth’s Curve

History of the Determination of the Figure of the Earth from Arc Measurements
- Preface: “The object of this book is to give a brief historical outline of the work done in ancient and modern times, to determine the figure of the earth from measurements and meridian arcs. The results here gathered are intended to show the progress and development of the work, thus enabling one to obtain a comprehensive idea of what has been accomplished in the subject, and to note the progress in methods and the precision attained.”
- https://archive.org/details/ahistorydetermi00buttgoog/page/n5
- Direct PDF Download: History of the Determination of the Figure of the Earth from Arc Measurements
Transcontinental Triangulation and the American Arc of the Parallel
- Extensive and detailed survey or the contiguous 48 states of the USA. From Atlantic to Pacific oceans.
- ftp://ftp.library.noaa.gov/docs.lib/htdocs/rescue/cgs_specpubs/QB275U35no41900.pdf
- Direct PDF Download: Transcontinental Triangulation and the American Arc of the Parallel
Reciprocal Zenith Angles
- https://youtu.be/P7DIQEauai0