Index[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] L cones laser collimators 2nd learning process Legrand lens coatings 2nd quality lenses 2nd 3rd 4th light pollution filters and impact on entrance pupil Light Pollution Reduction (LPR) filters 2nd 3rd 4th limiting magnitude at zenith (LMZ) line filters Linux-compatible planetarium software 2nd 3rd 4th 5th LMZ (limiting magnitude at zenith) logging logging systems 2nd log sheets long-period variable stars long-tube refractors 2nd Lunar observing |