Day, It is the time between dawn to dusk for a place in the earth. We know that the earth moves around the sun. The front side of the sun is the day. The earth also rotates on the axis of the north pole and south pole. This rotation of earth takes more than twenty-four hours. In a round figure, we take it as twenty-four hours. Therefore, a day lasts for twelve hours only. Every day of the year is not the same.
On 22 June every year, It lasts long. After that every day it decreases by some time. This continues up-to 22 December every year. Movement of the earth around the earth is elliptical and not circular. That is why when the earth comes nearest to the sun. The earth gets light in maximum time. Therefore it gets a long time of the lighted part. Day become longest.https://www.npmjs.com/package/dayjs
Every day on Earth starts at 12 PM in Greenwich, England. where fixation of the prime meridian. The prime meridian’s motivation was to help ships. adrift discover their longitude and decide their situation on the globe. Deciding longitude before long prompted the foundation of time regions and an organized, worldwide standard time.
The Royal Observatory in Greenwich, England, is the key area for timekeeping around the world. It is the originating point of the prime meridian. Which is 0 degrees longitude, where every day starts at 12 PM. All areas on Earth separates east and west of the prime meridian. Similarly that areas are estimates north and south from the equator. The Royal Observatory builds in 1675 by King Charles II . It helps ships adrift align their chronometers to decide longitude and area. The standard set for timekeeping, a key segment in deciding longitude. At Greenwich made it the watch of the world
Sun based time, as estimated by a sundial, can shift as much as 16 minutes consistently. An interim determines with the goal that the stamping of time can be normalized. We know it as Greenwich Mean Time. The turn of the Earth makes variety in sun oriented time east-west. Its early afternoon in one area might be 3 o’clock at another. A normalized area or prime meridian requires to precise figure mean sun oriented time and imprint time contrasts by longitude. This procedure settles the 24-time regions over the globe. The prime meridian utilizes as the beginning stage for each new day at noon. An imaginary line from the north pole to south pole through Greenwich is 0 points. On a difference of every 3 degrees, there is a line for measuring the time of that area.
One of the incredible challenges in the sea route was deciding longitude. To decide longitude, a boat chief needs to know the specific snapshot. at high early afternoon at his situation adrift. High early afternoon at a typical area, or the prime meridian. This is necessary aligned chronometers to keep time. The Royal Observatory in the end turned into the manager of time. As its stargazers could precisely record high early afternoon. Be that as it may. Different nations decided to situate their prime meridians in various areas to suit neighborhood needs, making coordination between countries troublesome. To take care of this issue, Greenwich, in 1884, turned into the official site of the prime meridian. The area for each new day and year to start.
Facilitation Universal Time
Keeping precise time has gotten advanced and fundamental for the multifaceted nature of the cutting edge world. Facilitation of Universal Time, or UTC, utilizes as the right time around the world and has supplanted GMT as the norm. The prime meridian is the place UTC is built up. While truly, stargazers set GMT utilizing sun based time, UTC is increasingly exact and relies on nuclear timekeepers. Sun powering time can have some room for give and take. Because of inconsistencies in the Earth’s turn, yet nuclear timekeepers align to be precise to the billionth of a second. A day has 86400 seconds from midnight to next midnight makes a day. Therefore one full day and night counts a day.
International date line.
The opposite side of the Greenwich longitude line is the international dateline. everyday date changes on this line show in the above figure. . this line is not straight. It is zigzag. Because of Sabrina and Alaska and Fizi. If we cross this line for east to west we add one day in the calendar. If we come from west to east we subtract one day in the calendar
The earth rotates on the axis is not vertical to the sun. It is inclined 23.4 degrees to the sun on the north. This affects the day and night in polar areas. In the south pole, the sum does not arise in winter seasons. In summer season days are too long for that area.
At the north pole some countries like Greenland, Sweden, Finland night is very short rather at night the sun rays are visible. this is we know as white night. Some countries in that area see the sun at night.