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Astronomical Time and Atomic Time
Astronomical Photo Album on the Web
24 Solar Terms - An introduction
History of Hong Kong Time Service
International Time Zones
Beginning of the 21
What is "Solar Eclipse"?
What is "Lunar Eclipse"?
What is a Comet?
What are "Meteor" and "Meteor Shower"?
The Mars Hoax
Basic Terms in Time Service
The Chinese Agricultural Calendar Explained
Apparent motion of planets Explained
What is "Opposition of Jupiter"?
What is "Parade of the Five Planets"?
What is "Twilight"?
Last revision date: <19 Dec 2013>