4 Questions
When crossing the International Date Line (IDL) from East to West, what change does a person have to make?
Add one day
If it is Wednesday 10 a.m. at 15⁰ E meridian, what will be the time at the International Date Line (IDL)?
Wednesday 9 p.m.
According to the international convention, at which meridian does the day and date change occur?
180° Meridian
Why is the International Date Line (IDL) not a straight line like the 180° meridian?
To accommodate geographical features
Study Notes
Crossing the International Date Line
- When traveling from East to West across the International Date Line (IDL), a person must subtract a day from their calendar date.
- The IDL is not a physical line, but rather an imaginary line on the Earth's surface that separates two consecutive calendar days.
Time Calculation
- If it is Wednesday 10 a.m. at 15⁰ E meridian, it would be Tuesday 22:00 (10 p.m.) at the International Date Line (IDL), since the IDL is 15 hours behind the 15⁰ E meridian.
International Convention
- According to the international convention, the day and date change occurs at the 180° meridian, which is the location of the International Date Line (IDL).
IDL Not a Straight Line
- The International Date Line (IDL) is not a straight line like the 180° meridian because it deviates from the 180° meridian to avoid dividing certain island groups and territories into two separate days.
Test your knowledge of the International Date Line and time zones with this quiz. Questions include scenarios involving crossing the IDL and calculating time differences between meridians.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
