Light day

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A light day is the distance that light travels in a vacuum in one day (thus a unit of distance, not time). Similarly, there are the light second, light minute, light hour, light week, light month and light year.

Numerical value

As opposed to the light year, whose value more or less depends on the definition of 'year', the value of the light hour is defined exactly.

Comparison to other units

  • 1 light day = 25,902,068,371.200 km = 2.5902068 * 1010 km
  • 1 light day = 16,094,799,105.225 mi[2] = 1.6094799 * 1010 mi
  • 1 light day = 84,980,539,275,590.551 ft[3] = 8.498053913 ft
  • 1 light day = 28,326,846,425,196.850 yd [4] = 2.8326846 * 1013 yd

Distances in light days

  • The maximum distance between the Sun and Sedna[5] is about 133,593 million km or 5.1 light days

Notes

  1. Review of Particle Physics Particle Data Group: W.-M. Yao et al., J. Phys. G 33, 1 (2006).
  2. 1 mi = 1609.344 m
  3. 1 ft = 0.3048 m
  4. 1 yd = 0.9144 m
  5. 2003 VB12, 90377