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Partial lunar eclipse on 1 January
(18 December 2009)

A partial eclipse of the moon will occur on 1 January (Friday). In Hong Kong, even with good weather conditions, people will only see the moon darkened with just a small part eclipsed owing to the small magnitude of the eclipse.

The lunar eclipse will occur between 1.15am and 5.30am with maximum eclipse at 3.23am. The eclipse has an umbral magnitude of just 0.082, meaning that only 8.2% of the moon's diameter will enter the umbra (total shadow) of the earth at maximum eclipse. Please refer to the attached diagram for the path of the moon during the eclipse.

Details of the partial lunar eclipse are as follows:

 
 

 Hong Kong Time

 Azimuth

 Elevation

 Moon enters penumbra

1.15am

 West-northwest

77 degrees

 Moon enters umbra

2.52am

 West

56 degrees

 Maximum eclipse

3.23am

 West-northwest

49 degrees

 Moon leaves umbra

3.54am

West-northwest

42 degrees

 Moon leaves penumbra

5.30am

West-northwest  

22 degrees

 
The next lunar eclipse visible in Hong Kong will occur on 26 June, 2010. It will be more observable with a magnitude of 0.542.

Please refer to the Observatory's website for a detailed explanation of the technical terms used for different stages of the eclipse: 
http://www.weather.gov.hk/gts/astron2010/lunar_eclipse_e.htm

 
Diagram: Partial eclipse of the moon on 1 January 2010
Diagram: Partial eclipse of the moon on 1 January 2010

 

 

Last revision date: <21 Dec 2012>