Snell was very involved with geodesy, the application of mathematics to the determination of the size
and shape of the Earth and the exact positions of points on its surface. In 1615 he established a network
of cities forming triangles. A single measurement of a carefully selected baseline of just a few hundred
meters enabled him to calculate the distance between all the communities via triangulation. He started
with his own house, and using the spires of local churches as points of reference, mapped a substantial
local area. He ultimately computed the distance between Alkmaar in the North and Bergen-op-Zoom in
the South, a distance of 130 km. His study of astronomy allowed him to find the latitude of these
towns, so he could calculate the distance between single lines of latitude, and therefore the
Snell was very involved with geodesy, the application of mathematics to the determination of the size
and shape of the Earth and the exact positions of points on its surface. In 1615 he established a network
of cities forming triangles. A single measurement of a carefully selected baseline of just a few hundred
meters enabled him to calculate the distance between all the communities via triangulation. He started
with his own house, and using the spires of local churches as points of reference, mapped a substantial
local area. He ultimately computed the distance between Alkmaar in the North and Bergen-op-Zoom in
the South, a distance of 130 km. His study of astronomy allowed him to find the latitude of these
towns, so he could calculate the distance between single lines of latitude, and therefore the
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