#space navigation

Soyuz Space Navigation Indicator

The space navigation indicator displayed the nadir of the spacecraft on a rotating terrestrial globe, indicating the spacecraft's location relative to Earth coordinates. It was also used to calculate day and night while in orbit, to plot landing coordinates, and to calculate open windows for communication.

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"The Global Positioning System uses time-delay measurements among satellite clocks to determine where you are on Earth," explained Scott Ransom of the National Radio Astronomy Observatory in Charlottesville, Va. "Similarly, by monitoring timing changes in a constellation of suitable millisecond pulsars spread all over the sky, we may be able to detect the cumulative background of passing gravitational waves."