Chinese people used to enjoy the fullest moon on Mid-Autumn Day, but it won't be at its fullest
on Friday and not on this festival until 2011, according to a
Chinese astronomer.
The fullest moon around the Mid-Autumn Day this year will be
11:13 a.m. Saturday, a day later than the festival set by the lunar
calendar, said Zhao Zhiheng, of the Astronomy Society of
Tianjin.
The fullness is decided by the speed at which the moon orbits
the earth. It slows when the moon moves on the far section of the
elliptical circle from the earth, a result of universal
gravitation.
The nearest point on the elliptical track is 360,000 km from the
earth while the farthest is 400,000 km, said Zhao.
From 2002 to 2005, the moon was fullest on the 15th day of the
eighth month on the lunar calendar, which was the Mid-autumn Day,
but from this year to 2010, it would be one day later.
In the past 19 years, the moon was fullest on Mid-Autumn Day in
seven years, one day later in nine years and two days later in
three years.
The moon becomes round every 29.5 days, said Zhao.
Enjoying the round moon and eating moon cakes with the family on
the 15th day of the eighth month on the lunar calendar is a Chinese
tradition. This year's Mid-Autumn Day falls on Friday, Oct. 6.
(Xinhua News Agency October 7, 2006)