J. Lewis Burtt

Galactic n. 1	1937 J. L. Burtt Daughter of Luna in Amazing Stories Aug. 71/1 "There I was installed in a room in the Hall of Records and shown the earth section and the methods of operating the machinery for the interpretation of the records. (These were in the form of a kind of sound-sight interpretation through an extremely complicated mechanism, and were given in the Galactic language that is used between worlds, a language that Imar had taught me to speak very fluently during my years with him.)
light-day n.	1933 J. L. Burtt When the Universe Shrank in Amazing Stories Nov. 103/1 These were spread out over the area of a circle of nearly one light-day in diameter.