Royal Observatory. Plan your visit. Top things to do. Discover gifts from the home of time Keep track of time with Royal Observatory Greenwich watches, and our famous Shepherd Gate clock, reproduced for your wall at home Shop. Buy Now. A stylish hour analogue clock that will make a statement on any wall, with its bold monochrome face, and matte black metal casing How old is Earth? How fast can you think? How long is a light year and how short is a femtosecond? What does Greenwich Mean Time mean?
Can you tell the time with flowers? When did time begin? This light-hearted, illustrated miscellany from Royal Observatory Greenwich goes a long way to answering some of these questions and also presents a whole range of other amazing facts and figures which show the influence of time on our daily lives Visit Us. Search Want to search our collection?
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How viruses shape our world. The next one is February 29, Leap year rules: Which years are leap years? What Is a Leap Year? Leap years are years where an extra, or intercalary, day is added to the end of the shortest month, February. The intercalary day, February 29, is commonly referred to as leap day. Leap years have days instead of the usual days and occur almost every four years.
Leap days keep our modern-day Gregorian calendar in alignment with Earth's revolutions around the Sun. It takes Earth approximately This is called a tropical year , and it starts on the March equinox. However, the Gregorian calendar has only days in a year.
If we didn't add a leap day on February 29 almost every four years, each calendar year would begin about 6 hours before the Earth completes its revolution around the Sun see illustration. As a consequence, our time reckoning would slowly drift apart from the tropical year and get increasingly out of sync with the seasons.
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