<Li> Miscellaneous <Ul> <Li> λ, observer's longitude </Li> <Li> φ, observer's latitude </Li> <Li> ε, obliquity of the ecliptic (about 23.4 °) </Li> <Li> θ, local sidereal time </Li> <Li> θ, Greenwich sidereal time </Li> </Ul> </Li> <Ul> <Li> λ, observer's longitude </Li> <Li> φ, observer's latitude </Li> <Li> ε, obliquity of the ecliptic (about 23.4 °) </Li> <Li> θ, local sidereal time </Li> <Li> θ, Greenwich sidereal time </Li> </Ul> <Li> λ, observer's longitude </Li> <Li> φ, observer's latitude </Li>

Who made the first coordinate system for the sky