What is a Leap Year?
• Sri Lanka
30 Nov 06
You seem to be getting more responses than a previous discussion about the leap year. Basically it is an year with 366 days where Februay has 29 days. But the following is a more scientific explanation: When people had to be punctual scientists took the revolution of the Cecium atom to create a unit called "second" based on that they arrived at the 24 hour day. But it did not match with the rotation of the Earth. In fact an year was close to 365.25 days. To correct this every 4 years a leap year was declared. But then another small error crept in. To correct this every century that was not divisible by 400 was declared not to be a leap year. Therefore 2000 is a leap year and 3000 is not. In fact after 2096 the next leap year will come after 8 years i.e. 2104.
29 Nov 06
Leap years are years with an extra day (February 29); this happens almost every four years. Generally , leap years are divisible by four, but century years are special, they must also be divisible by 400. The year 2000 was a leap year. The years 2001, 2002, and 2003 are not. LEAVITT, HENRIETTA Henrietta Swan Leavitt (1868-1921) was an American astronomer who first described the relationship between the period and the brightness (luminosity) of Cepheid variable stars. ... in short A year of 366 days, an additional day being added to February