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    7/14/2009

    7/22,日全食攻略

    1.错过了也不可惜

    日全食是比较常见的天文现象,几乎每年都有.但每次能看到的位置不一样,所谓的错过这次再等300年是骗人的.但为了看次日全食而专门跑到太平洋上某个小岛对大多数人是不现实的,所以,既然这次家门口就有得看,那就看啦!

    2.时间计算

    整个日食过程漫长,而真正全食很短暂,这次据说有4分钟,那是相当长了.把握观看时间很重要,因为日全食的几个精彩看点只有10几秒钟,如何目睹以及抓拍这一瞬间,就需要相当精确的计算.在地球上不同地点,不同高度观看的时间和角度是不一样的.

    http://159.226.71.170/seclany.htm 这个日全食计算器相当方便,但需要经纬度和海拔数据.可以通过两种方法获得:在你的观看位置打开GPS,或在GOOGLE EARTH里查询,注意的是GOOGLE EARTH的海拔数据还需要加上你所处楼层的高度.

    我计算出的位置是:

    image

    3.看点

    BAILEY'S BEADS:当接近全食时,阳光从月球环形山折射出来形成的光珠,类似美剧HEROES片头效果.全食前的十几秒.

    image

    diamond ring:最后一颗光珠被遮蔽时,会产生巨大的光线反差,造成钻戒般视觉体验.只在全食前几秒钟.

    image

    日全食时,平日被太阳光遮蔽的水星会现身说法,大多数人一辈子都没见过水星.

    4.必备器材

    拍照的话,巴德膜是必不可少的,这里有卖.不然阳光聚焦取景器会烧坏视网膜,造成永久创伤,而且视网膜没有痛感神经,等你眼镜被太阳灼瞎了都没有感觉.

    http://item.taobao.com/auction/item_detail-0db2-80c464fd3f22fd4dade67b8be2717f1d.jhtml?cm_cat=0

    不拍照的,拿个小学时候的垫板看看就行了.

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