春秋分日，首先是一年中太阳正东方升起正西方落下的唯一两天。麦克罗伯特说。
The spring and autumnal equinoxes, for starters, are the only two times during the year when the sun rises due east and sets due west, according to MacRobert.
这个红色的星球目前离我们大约是1亿公里，当它在东方的夜空升起时就象一盏红色的指路明灯那样耀眼。
The Red Planet is currently around a 100 million km distant from us and shines like a brilliant red beacon as it rises in the east on its journey across the night sky.
春分过24小时后太阳应该从东方偏北升起，沿弧线上升一会儿后就正好出现在照片中的东方。
Waiting 24 hours allowed the Sun to rise just north of east and arc back to an exactly eastern alignment for the photo.
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