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The Sidereal Day: Using your wristwatch and observations of the night sky over the course of a few weeks, how can you demonstrate to a friend that 24 hours cannot be the true rotation period of the Earth (often called the sidereal day)? What assumptions do you make in this argument?
Exchange Rate
The monetary worth assigned to one currency when converting it to another currency.
United States
A country located in North America, consisting of 50 states and a federal district, known for its diverse geography and economy.
Portugal
A country located in Southern Europe on the Iberian Peninsula, known for its long history, cultural heritage, and maritime explorations.
Exchange Rate
The value of one country's currency expressed in terms of another country's currency.
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