Weather Chit Chat Issue 79 - HKO Web Tour (December 2020)
Tour of the Observatory
The Hong Kong Observatory has been providing weather monitoring, forecasting and early warning services for over a century, and is closely related to people's lives. How much do you know about the Observatory? (More……)
Caesium Beam Atomic Clock
In addition to weather monitoring, forecasting and early warning services, the Observatory is the official timekeeper in Hong Kong. The time service is based on the caesium beam atomic clock. The latest generation of caesium beam atomic clocks is the product of 40 years of technological evolution, and has an accuracy within 0.01 millionths of a second per day. But how accurate is the caesium beam atomic clock? How does it work? (More……)