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Partial lunar eclipse in Hong Kong on 21 December
(9 December 2010)

A total lunar eclipse will occur on 21 December (Tuesday), but will only be visible as a partial eclipse at some places in Hong Kong if the weather is fine.

Scientific Officer of the Hong Kong Observatory, Mr Woo Wang-chun, said, "By the time the moon rises that afternoon, the eclipse will have started. The only part of the eclipse that will be visible in Hong Kong occurs when the moon is about to leave the umbra." The moon will rise at 5.44pm and leave the umbra at 6.02pm. The eclipse will end at around 7.06pm. 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

Direction (Azimuth)


Moon rise


East-northeast (64)

-1 degrees

Moon leaves umbra 


East-northeast (66)

3 degrees

Moon leaves penumbra 


East-northeast (71)

16 degrees

"As the elevation of the moon is very low during the eclipse, the event can only be observed at places with an unobstructed view of the horizon in the direction of east-northeast, such as from Pak Shek Kok Promenade, Plover Cove Reservoir or the top of Tai Mo Shan," said Mr Woo.

The next lunar eclipse observable in Hong Kong will occur on on 16 June, 2011. It will be a total eclipse.

Please refer to the Observatory's website for a detailed explanation of the technical terms used for different stages of the eclipse: 

The path of the moon during the eclipse on 21 December, 2010
The path of the moon during the eclipse on 21 December, 2010

Last revision date: <21 Dec 2012>