- Xi Draconis (ξ Draconis, abbreviated Xi Dra, ξ Dra) is a double or binary star in the northern circumpolar constellation of Draco. It has an apparent visual magnitude of 3.75. Based upon parallax measurements, it is located at a distance of 112.5 light-years (34.5 parsecs) from the Sun. At this distance, the apparent magnitude is diminished by 0.03 from extinction caused by intervening gas and dust.
- Lord–bondsman dialectic (Wikipedia)
The lord–bondsman dialectic (sometimes translated master–slave dialectic) is a famous passage in Georg Wilhelm Friedrich Hegel’s Phenomenology of Spirit. It is widely considered a key element in Hegel’s philosophical system, and it has heavily influenced many subsequent philosophers.