To allow astronomical observations, Kvant-1 carried – in addition to two Earth horizon sensors, two star sensors, and three star trackers – six gyrodines which permitted extremely accurate pointing of the entire Mir complex. As the gyrodines were powered by electricity, they also reduced significantly the amount of attitude control propellant needed by the Mir base block's control thrusters – saving 15 tons of propellant in the first two years. They did, however, use a great deal of electricity – the average consumption of the Kvant-1 module was estimated to have been 6.90 kW.