RISING
, in Astronomy, the appearance of the sun, or a star, or other luminary, above the horizon, which before was hid beneath it.
By reason of the refraction of the at mosphere, the heavenly bodies always appear to rise before their time; that is, they are seen above the horizon, while they are really below it, by about 33′ of a degree.
There are three poetical kinds of Rising of the stars. See Acronical, Cosmical, and Heliacal.