日全食（资料图）
中国科学院、国家天文台等部门5月19日联合举行新闻发布会介绍，今年7月22日上午8时至11时左右，将发生两千年以来时间最长、也是本世纪最重要的一次日全食，中国为世界上最佳的观测点。
据与会的专家说，本次日全食从初亏至复圆长达两个多小时，中国境内可以看到的最长日全食时间可达6分钟，全食带宽度可达250公里，自西向东经过西藏南部、四川中部、湖北南部、河南南部、安徽南部、江苏南部、浙江北部和上海等省区市。
据介绍，此次日全食将是2143年来持续时间最久的一次日全食。“一般日全食平均在3分钟左右，这次我国长江中下游地区能看到5到6分钟的日全食，十分罕见。“中国天文学会理事长、国家天文台副台长赵刚说。
在昨天的发布会上，中国天文学会和中科院国家天文台还向铜陵、桐城、黟县、嘉兴、苏州、高淳、常州、无锡等8个城市颁发“2009年日全食指定观测点”牌匾与证书。
北京可观日偏食
赵刚介绍，除了横穿我国的日全食带中的地方可看到日全食外，我国的其他地方均能看到程度不一的日偏食。北京市民届时可观测到日偏食，太阳大约将被遮挡七成到八成。“能感到变黑的感觉，但不是很明显。“他说，如果市民要观测，一定要准备好观测的工具，不可直接用肉眼观测日偏食。
温馨提示
专家特别强调，在日全食发生的某些阶段，如果不采用科学的观看方法，将对人的眼睛造成伤害，严重者甚至永久失明。偏食期间，比较安全的方法是戴一副日全食观测镜，或者用装有墨水的水盆通过反射观看，用望远镜观测一定要在目镜或探测器前加滤光片，全食期间，则可用肉眼直接观看。
译文:
China: The Best Observation Deck of The Most Lasting Solar Totality in July 2009 Since Bimillennium
Solar Totality（File）
CAS (abbr. of Chinese Academy of Sciences), NAOC (abbr. of National Astronomical Observatories Chinese Academy of Sciences) and other sections jointly held a press conference on May 19, 2009 and introduced that during 08:00am to around 11:00am of this July 22, there will happen a solar totality which is most lasting since bimillenium and also most significant within the 21st century. Furthermore, China is the best obersavation place in the world.
As what attended experts said, this totality will last for over two hours from initial wane to completion. The longest seeable solar totality will reach 6 minutes within China. Width of totality band will extend 250 kms, from west to east through south Tibet, central Sichuan, south Hubei, south Henan, south Anhui, south Jiangsu, north Zhejiang, Shanghai and so on autonomous region, provinces and city.
It is introduced that it will be the longest period of solar totality during the past 2143 years. "Common solar totality averagely lasts for 3 minutes or so. But this time, it will rarely soar 5 to 6 minutes in the middle and lower reaches of Changjiang River in China." ZHAO Gang said as Director of Chinese Astornotary Society (abbr. CAS) and Vice-head of NAOC.
In the conference, CAS and NAOC also awarded tablets and certificates of "2009 Solar Totality Designated Observation Point" to the 8 cities of Tongling, Tongcheng, Yixian, Jiaxing, Suzhou, Gaochun, Changzhou and Wuxi.
Beijing: Partial Solar Eclipse Can Be Seen
ZHAO Gang mentioned that except those places where totality band cross China covers, in our all other places, people can observe partial solar eclipse at different levels. Beijing citizens will be able to observe partial solar eclipse at that time; the sun will be sheltered 70% to 80%. "People can feel nigrescence but it's not obvious." He said and reminded if citizens want to observe, observasion tools must be gotten ready; artial eclipse is never observed by naked eyes.
Kindly Reminder
Experts specially stressed that to some certain stages of solar totality, if people adopt unscientific observation methods, his/her eyes will be wounded, extremely permanent ablepsia. During the period of partial eclipse, safer measures are wearing a pair of observation glasses or observing thru reflection of laver with ink. Optical filters must be inserted in the front of ocular or detector to those who will use telescope to observe. But in the period of totality, people can see by unaided eyes.