Latitude in Snyder (page 15): For the "normal" Mercator projection (on the ellipsoid) this function defines the spacing of the parallels: if the length of the equator on the projection is (units of length or pixels) then the distance, , of a parallel of latitude from the equator is The isometric latitude is closely related to the conformal latitude : The formulae in the previous sections give the auxiliary latitude in terms of the geodetic latitude. The expressions for the geocentric and parametric latitudes may be inverted directly but this is impossible in the four remaining cases: the rectifying, authalic, conformal,
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