Circle of Perpetual Apparition

Small circle of the celestial sphere, parallel to the equator, the n. polar distance being equal to the latitude of the place. All stars within the circle are constantly above the horizon. An equal circle about the s. pole, within which all stars are constantly below the horizon, is called the circle of perpetual occultation. This definition applies to the n. hemisphere. In the southern the conditions are reversed. IMG:content-0887.png:[blocks in formation] in one way as in the FIELD TUBES (q.v.). Ample disengagement area for the steam-gas bubbles from the water is a con overheating of plates, when steam keeps the cooling water from the metal.