It's called the International Date Line, and it runs a rather wiggly track from north to south through the Pacific Ocean. At one second after midnight along the Date Line, the calendar begins a new local day. At the same time, it is about noon local time at the Prime Meridian.
Greenwich meridian
Noon and midnight are the two times that divide AM and PM. There is one "imaginary line" between 11:59am and 12:00pm (noon) and another between 11:59pm and 12:00am (midnight).
The counting of the day begins from midnight because the earth routates around the sun.
The menstrual cycle begins with day 1 which is the first day of bleeding. The last day of the cycle is the day before the next period begins.
Line graph
Greenwich meridian
The International Date Line.
The International Date Line, located in the Pacific Ocean, is where each new calendar day begins at midnight. This imaginary line marks the boundary between one calendar day and the next, and is used to define time zones and the change of dates.
The hypothetical line where each calendar day begins is called the dateline. It is approximately along the 180 meridian.
The equator.... :)
what is the imaginary line where the date becomes one day earlier to the east of the line?
The International Date Line closely follows the 180-degree meridian. It is an imaginary line that determines where one day ends and the next begins. When crossing the International Date Line from east to west, you 'lose' a day, and when crossing from west to east, you 'gain' a day.
The International Date Line is drawn on a map to mark the point where each day officially begins. It is an imaginary line that runs from the North Pole to the South Pole and helps to account for the differences in time zones and days around the world. It ensures that as you cross it, you either gain a day or lose a day depending on the direction of travel.
international dateline
The International Date Line marks the location where a new day begins. It is an imaginary line that runs north to south in the Pacific Ocean, roughly following the 180° line of longitude. Crossing this line eastward results in moving the clock back 24 hours, while crossing it westward means moving the clock ahead 24 hours.
That would be the "International Date Line" which is skillfully drawn to avoid crossing any land mass.
The international Date Line.