How Halley's Comet was recognized as a returning object

A comet was recognized as returning

75–76 years

In 1705, astronomers recognized that repeated sightings were of the same comet, returning every 75–76 years. It was the first evidence that something besides a planet repeatedly orbited the Sun.

None of Nunavut's 25 communities are connected to each other by road

Nunavut covers an enormous part of northern Canada, but none of its 25 communities has a road connection to another Nunavut community or to the main North American road network.

Nahua communities kept some local control under Spanish rule

In Indigenous Nahua communities, Spanish rulers often relied on local nobles and city-states. The communities kept considerable control over local affairs, while the arrangement also let the Spanish collect taxes and exploit Indigenous labor.

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How Halley's Comet was recognized as a returning object

A comet was recognized as returning

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