Taiwan mainland land connection rising seas

Taiwan was once joined to mainland Asia

People lived on Taiwan 20,000–30,000 years ago, when it was still physically connected to mainland Asia. Rising seas severed that connection about 10,000 years ago.

Navigation satellites also provide precise timing

Global navigation satellite systems provide location, but their precise timing signals have other uses. Telecommunications networks use them to stay synchronized, and scientists use them as a reference in earthquake studies.

Snell measured Earth using a chain of 33 triangles

33 triangles

In 1615, Willebrord Snell measured about 70 miles between two Dutch towns using a chain of 33 triangles. The towns were about one degree of latitude apart, so he could use that distance to estimate the size of Earth's full circumference.

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Taiwan mainland land connection rising seas

Taiwan was once joined to mainland Asia

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