Time Zones quiz
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Why can a Sydney to Los Angeles flight land 'before' it left?
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More questions about Time Zones
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Which industry first needed towns to share one clock time?
Answer: Railways
Why: North American railroads switched to standard time zones on 18 November 1883, remembered as the Day of Two Noons.
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How many different calendar dates can be in use on Earth at once?
Answer: Three
Why: The earliest zone, UTC+14 in Kiribati, sits 26 hours ahead of the latest, UTC-12 on Baker Island, so three dates overlap two hours a day.
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When does the Greenwich time ball drop each day?
Answer: 1 p.m.
Why: Noon was already taken: Greenwich astronomers were busy timing the Sun crossing the meridian, so the ball falls an hour later.
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Which novel's hero wins a bet by gaining a day travelling east?
Answer: Around the World in 80 Days
Why: Travelling east, Fogg's party saw 80 sunrises while London saw 79, so he got home a day earlier than his own count said.
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Around what clock time is the Sun highest in Madrid in summer?
Answer: Around 2 p.m.
Why: Madrid lies west of Greenwich yet keeps Central European Time, so summer clocks run over two hours ahead of the Sun.
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Where was Greenwich picked as the Prime Meridian in 1884?
Answer: Washington
Why: The vote in Washington went 22 for Greenwich, with San Domingo against and France and Brazil abstaining.
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