• Fri
  • Dec 19, 2014
  • Updated: 8:07am

Celestial Mechanics

Perihelion Day

Special day

On Monday, the earth was at its closest position to the sun in its year-long journey through the solar system. This special day is called Perihelion Day.

Wednesday, 5 January, 2011, 12:00am

Reverse action

Slipping back in time sometimes seems possible for the owners of a retrograde watch, so named because the hour and date hands leap back to their starting point once they reach the last second of a cycle, instead of completing a 360-degree clockwise revolution. Seeing the hand of the timepiece rebound creates the irresistible sensation of erasing the past; a visual treat for watch lovers.

18 Jul 2010 - 12:00am

Sun days

You may have noticed that Chinese solar months start at some point between the fourth and eighth day of a Western month. For instance, the ninth solar month of the Chinese calendar (the Month of the Dog) starts on October 8 and runs until November 6. This is dictated by the use of the 24 solar terms or jie chi in fung shui calculations.

11 Oct 2009 - 12:00am

Far-sighted mission

The telescope recently notched its 400th anniversary; in the summer of 1609 Italian scientist Galileo demonstrated his first refracting model.

6 Sep 2009 - 12:00am

News Quiz

1. Golden girl Lee Lai-shan drew the curtain on an illustrious Asian Games career by winning the gold medal in .

A. surfing

B. windsurfing

C. tennis

D. athletics

2. The education secretary denied interfering with the autonomy of two leading universities by voicing support for them to .

A. close

9 Oct 2002 - 12:00am