Read the following passage:
Early navigators struggled for centuries to determine longitude at sea, often leading to disastrous shipwrecks on uncharted reefs. John Harrison's invention of the marine chronometer represented a brilliant triumph of human ingenuity over formidable physical obstacles. Despite facing persistent resistance from academic astronomers who favored complex lunar calculations, Harrison meticulously perfected a mechanical timepiece capable of keeping immaculate time amid rolling ocean swells and extreme temperature swings. His remarkable perseverance ultimately transformed oceanic voyaging from a perilous gamble into a precise science.
The author's attitude toward John Harrison's achievement can best be described as admiring and appreciative.
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