International Date Line

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Definition
  1. Proper noun:
    • An imaginary line on the Earth's surface: The International Date Line is an imaginary line that roughly follows the 180° meridian of longitude in the Pacific Ocean. It is the line where the calendar date changes.
Usage
  • The International Date Line is used to designate the place where each new calendar day begins.
  • Crossing the International Date Line causes the date to change by one day.
Examples
  • Proper noun:
    • When you cross the International Date Line traveling east, you subtract a day.
    • The island nation of Fiji lies just west of the International Date Line.
    • The concept of the International Date Line is essential for global timekeeping and travel.
Advanced Usage
  • "across the International Date Line": Referring to locations or travel on opposite sides of this line.
    • Communicating with someone across the International Date Line requires careful attention to the day and time.
  • "International Date Line shift": A historical or proposed adjustment to the line's path, often for political or economic reasons.
    • Kiribati's eastern islands enacted an International Date Line shift in 1995 so the entire nation could share the same weekday.
Variants and Related Words
  • Date Line (noun): A common shortened form for "International Date Line."
    • The ship will cross the Date Line at midnight.
  • 180th meridian (noun): The line of longitude at 180°, which the International Date Line approximately follows.
    • The 180th meridian is directly opposite the Prime Meridian.
Synonyms
  • Calendar line: A less common term describing the same concept.
Related Phrases
  • Cross the date line: The act of traveling over the International Date Line.
    • After we cross the date line, it will suddenly be tomorrow.
Noun
  1. an imaginary line on the surface of the earth following (approximately) the 180th meridian