Definition of lunar observation in English:

lunar observation

Line breaks: lunar ob¦ser|va¦tion

noun

  • A measurement of the position of the moon in order to calculate longitude from lunar distance.
    More example sentences
    • He speculated that he would continue to ‘amuse’ himself in attempting to determine Monticello's longitude but with lunar observations.
    • At the Greenwich Royal Observatory Halley used the first transit instrument and devised a method for determining longitude at sea by means of lunar observations.
    • If you had a chronometer, you would use it to measure longitude all the time, not just "when lunar observations were impractical."

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