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The light-day, or light day, is an astronomical unit of distance defined as the distance that light travels in free space (or vacuum) in one day.
The light-day is equal to 2.590206837 × 1013 meters (1 light-day = 2.590206837 × 1013 m), the base unit of length in the International System of Units (SI). The light-day is also equal to 2.590 × 1010 kilometers (km) (an SI unit of length), or approximately 1.609 × 1010 miles (mi) or 8.4981 × 1013 feet (ft), which are US customary / Imperial units of length.
The light-day along with light-second, light-minute and light-hour are used in popular science publications. One light-day is equal to 86,400 light-seconds, or 1,440 light-minutes, or 24 light-hours or about 0.002738 light-years.