Full record for light-day n.

Definition the distance light travels in 24 hours
OED requirements antedating 1943
Earliest cite A.E. van Vogt, "Concealment"
Comment Malcolm Farmer submitted a 1956 cite from Raymond F. Jones' "Academy For Pioneers". Fred Galvin submitted a 1949 cite from Robert Abernathy's "The Giants Return". Fred Galvin submitted a cite from a 1970 reprint of A.E. Van Vogt's "Concealment", which Mike Christie verified in its original 1943 publication,

Earliest cite in the OED: 1963

Last modified 6 July, 2008

Citations for light-day n.

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1943 A. E. van Vogt Concealment in Astounding Sci.-Fiction Sept. 93/2 If you wish, I will prepare orbits involving maximum speeds of ten light days a minute to all the nearest stars.
1949 R. Abernathy Giants Return in Planet Stories Fall 45/2 One light-day out from Procyon, the thirty-third day by ship's time since leaving Earth.
1956 R. F. Jones Academy for Pioneers in Astounding Sci. Fiction May 94/2 It was an insignificant run to the region of Proteus VI. The hyper-drive of the Paracelsus made the two light-day trip in a matter of subjective micro-seconds, but even so the shift required the usual preparations of banking down all electro-magnetic equipment of any kind.
1999 M. J. Friedman My Brother's Keeper i. i. 4 There's a planet a few light-days away from here.