International Date Line — Flashcards
Maharashtra Board · Class 9 · Geography
20 flashcards for International Date Line (Maharashtra Board Class 9 Geography) to test yourself on key terms and facts.
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What is the International Date Line (IDL)?
Answer
The International Date Line is an imaginary line that runs roughly along the 180° meridian in the Pacific Ocean. It is an international convention where the day and date change when crossing this line…
Why was the International Date Line established in 1884?
Answer
The IDL was established in 1884 under the leadership of American professor Davidson to solve the confusion about when a new day starts on Earth. Representatives of many nations decided to create this …
Along which meridian does the International Date Line roughly run?
Answer
The International Date Line roughly runs along the 180° meridian, which is opposite to the Greenwich Prime Meridian (0°). However, it is not a straight line and deviates to avoid land masses and islan…
What happens when you travel from east to west across the IDL?
Answer
When traveling from east to west across the IDL, you must subtract one day from your calendar. For example, if it's Friday when you cross from America (east) to Japan (west), it becomes Thursday on th…
What happens when you travel from west to east across the IDL?
Answer
When traveling from west to east across the IDL, you must add one day to your calendar. For example, if it's Thursday when you cross from Japan (west) to America (east), it becomes Friday on the other…
Why is the IDL not a straight line like the 180° meridian?
Answer
The IDL is not straight because it has been adjusted to avoid passing through land masses and island groups. If it passed through populated areas, people would have different dates on either side of t…
Which ocean does the International Date Line primarily pass through?
Answer
The International Date Line primarily passes through the Pacific Ocean. This was deliberately chosen because the Pacific Ocean has fewer inhabited islands compared to other oceans, minimizing confusio…
On which side of the IDL does a new day start first - east or west?
Answer
A new day starts first on the WEST side of the IDL. Countries like Japan, Australia, and New Zealand (west of IDL) experience the new day before countries like USA and Chile (east of IDL). The day sta…
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