Mr. Sadler, the celebrated aeronaut, ascended on one occasion in a
balloon from Dublin, and was wafted across the Irish Channel; when,
on his approach to the Welsh coast, the balloon descended nearly to
the surface of the sea. By this time the sun was set, and the shades
of evening began to close in. He threw out nearly all his ballast,
and suddenly sprang upward to a great height; and by so doing brought
his horizon to _dip_ below the sun, producing the whole phenomenon
of a western sunrise. Subsequently descending in Wales, he of course
witnessed a second sunset on the same evening.--_Sir John Herschel’s
Outlines of Astronomy._