Circle of latitude can be calculated by a common sine or cosine function. The 60th parallel north or south is half as long as the Equator (disregarding Earth's minor flattening by 0.3%). A circle of latitude is perpendicular to all meridians. The latitude of the circle is approximately the angle between the Equator and the circle, with the angle's vertex at Earth's centre. The equator is at 0°, and the North Pole and South Pole are at 90° north and 90° south, respectively. The Equator is the longest circle of latitude and is the only circle of latitude which also is a great
The Middle-Earth Album The Middle-Earth Album The Middle-Earth Album is the fifth studio album by American progressive rock band Glass Hammer, released on June 15, 2001. It is the band's second album based on J.R.R. Tolkien's novel "The Lord of the Rings", after their 1993 debut album "Journey of the Dunadan", and their second release not to be concept album, after 1998's "On to Evermore". It is the first album to feature singer Susie Bogdanowicz after she joined as band member, and as such the first album to feature the band's longest and steadiest line-up, which would last until their tenth studio album,