Latitude exact relationship of parallels and meridians with horizontal and vertical: both are complicated curves. On the sphere the normal passes through the centre and the latitude () is therefore equal to the angle subtended at the centre by the meridian arc from the equator to the point concerned. If the meridian distance is denoted by then where denotes the mean radius of the Earth. is equal to . No higher accuracy is appropriate for since higher-precision results necessitate an ellipsoid model. With this value for the meridian length of 1 degree of latitude on the sphere is (60.0 nautical miles).
Total eclipses on the Moon Total eclipses on the Moon Total solar eclipses on the Moon are caused when the Earth passes in front of the Sun, blocking much its light. Viewers on Earth will see a total lunar eclipse. The last total solar eclipse on the Moon was in July 2018. Unlike the Earth which sees its eclipse for up to 2 1/2 hours the longest in one area as the Moon's shadow touches for over 5 1/2 hours the longest. Some of the eclipses on the Moon lasts for about 5 hours in one area the longest as the Earth's shadow touches for