AstroLab
AstroLab

AstroLab

∆+∆+∆+∆≈∂≈∂≈∂≈∂

∆+∆+∆+∆+∆+∆+∆+∆+∆+∆
≈∂≈∂≈∂≈∂≈∂≈∂≈∂≈∂≈∂≈∂