Astronomy Picture of Day: Setting Sun Trail# Astronomy - 天文
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A Setting Sun Trail
Explanation: The Sun appears to move on the sky because the Earth rotates. The extreme
brightness of the Sun, however, makes it difficult to capture a sun-trail -- the path the Sun
traces on the sky. To capture the above picture, a very dark filter covered the camera lens for
most of the time, allowing only a trifle of light from the bright Sun to peek through. Just after
the Sun had dipped below the horizon but before it was completely dark, the thick filter was
removed and
Explanation: The Sun appears to move on the sky because the Earth rotates. The extreme
brightness of the Sun, however, makes it difficult to capture a sun-trail -- the path the Sun
traces on the sky. To capture the above picture, a very dark filter covered the camera lens for
most of the time, allowing only a trifle of light from the bright Sun to peek through. Just after
the Sun had dipped below the horizon but before it was completely dark, the thick filter was
removed and