Since the plane of the orbit of Mercury does not exactly coincide with the plane of the Earth's orbit, Mercury normally seems to pass above or below the Sun.
The time sequence shown in this photograph, taken from a balcony in Belgium on May 7, shows the complete crossing. The solar cross lasted more than five hours, so the 23 images above were taken more or less 15 minutes apart.
The north pole of the Sun, the Earth, the orbit of Mercury, although all different, all are in directions slightly above the left part of the image.
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