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IELTS AcademicReadingSummary Completion
Level 3 Trap Drill
Can you avoid the examiner's trap?Select an option to evaluate
Passage excerpt: 'The invention of the marine chronometer by John Harrison in 1761 solved the historic 'longitude problem'. While latitude could be calculated easily by measuring the solar altitude at noon or the position of Polaris, determining longitude at sea required knowing the exact local time at a prime reference meridian (Greenwich) compared with local solar time aboard ship.'
Complete the summary: Navigators historically found longitude far more difficult to determine than latitude because calculating longitude required an extraordinarily accurate measurement of _______ at a fixed reference meridian to compare against shipboard time.
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