How do astronauts see time on the moon?

September 2, 1752 (Wednesday), was a very special day in the history of sleep. After falling asleep that night, millions of Britons did not wake up until September 14. This amazing feat was caused not by magic or powerful sleeping pills, but by changing the calendar. Pope Gregory XIII instituted a new calendar in 1582, but the calendar was not introduced to Britain and North America until 1752, which stipulated that Wednesday, September 2, be followed by Thursday, September 14. The change to the calendar has sparked public protest from some. In London, for example, bankers protested, refusing to pay taxes on March 25, the previous date. They insist the tax payment date should be pushed back 11 days to April 5, which is still the end of the UK tax year.

A popular science book about time, “Time Miscellaneous”, launched by the famous astronomical research institution “Greenwich Observatory” in the UK, was published recently. This is a small story recorded in the book.

“Time” is one of the most used words in human language. It permeates all natural phenomena and accompanies people’s daily life and social activities. People pay attention to time and think about time. But what is time? How is the calendar compiled, and why are there leap years, leap months, and even leap seconds? Does time have a beginning and an end? Can time be turned back? Can people travel back in time through the so-called “time tunnel”? These are not easy questions to answer.

Founded in 1675, the Greenwich Observatory in England is known as the “home of time” and has played an important role in astronomical observation and precise timekeeping for hundreds of years. The line of longitude that passes through the Greenwich Observatory’s meridian is 0 degrees longitude, the prime meridian. In 1997, the former site of the Greenwich Observatory was listed as a World Heritage Site by UNESCO. In “Time Talk”, experts from the Greenwich Observatory used hundreds of cold knowledge and a large number of hand-drawn drawings to answer all kinds of strange time problems. How far is a light-year and how short is a femtosecond? What does playing cards have to do with the calendar? How do astronauts see time on the moon? …The book also mentions frozen time, time written in the stars, time with cats, time in ketchup… These seemingly ordinary things connect important discoveries about time in the history of science and reveal time. profound impact on our daily lives.