CIRCLE of Perpetual Occultation, another lesser circle at a like distance from the equator, containing all those stars which never appear in our hemisphere. The stars situated between these circles alternately rise and set at certain times.
Polar Circles are immovable circles, parallel to the equator, and at a distance from the poles equal to the greatest declination of the ecliptic. That next the north pole is called the Arctic, and that next the south pole the Antarctic.
Druidical Circles, a name given to certain ancient inclosures formed by rude stones circularly arranged; as that of Stonehenge near Salisbury. These, it is now generally supposed, were temples, and also places of solemn assemblage for councils or elections, and seats of judgment.