Full record for Sol n.

Definition the sun as a star, rather than as a personification
OED requirements antedating 1929
Earliest cite L. F. Stone 'Out of the Void'
Comment Brian Hopper submitted a cite from a 1968 reprint of Robert Heinlein's "Red Planet". Rick Hauptmann verified this cite in a 1950 reprint
James Birdsall submitted a cite from a 1985 reprint of Andre Norton's "Star Rangers".
Jeff Wolfe submitted a cite from a 1983 reprint of H. Beam Piper's 1952 novel "Uller Uprising".
Imran Ghory submitted a cite from a 1995 reprint of Isaac Asimov's "Escape"; Mike Christie verified it in the 1945 original appearance.
Enoch Forrester submitted a cite from a 1965 reprint of E.E. Smith's "Triplanetary"
Dan Tilque submitted a cite from E.E. Smith's "Galactic Patrol"; Mike Christie verified it in the original 1937 magazine appearance.
Enoch Forrester submitted a 1983 cite from David Brin's "Startide Rising".
Fred Galvin submitted a cite from a reprint of John W. Campbell's "The Black Star Passes"; but Andrew May determined that the cite was not in the original 1930 magazine appearance.
Katrina Campbell submitted a cite from a 1992 reprint of Anne McCaffrey and Jody Lynn Nye's 1990 "The Death of Sleep".
Jeff Prucher submitted a 1931 cite from Nathan Schachner and Arthur Leo Zagat's "The Emperor of the Stars".
Jeff Prucher submitted a 1929 cite from Leslie F. Stone's "Out of the Void".
Fred Galvin submitted a 1932 cite from John W. Campbell Jr.'s "Invaders From the Infinite"

Note that some of the early cites refer to "Old Sol", which sounds as if they may be rather more like a personification than a purely astronomical reference. (The OED has cites going back to 1450 for the sense of the Sun personified)

Last modified 31 July, 2019

Citations for Sol n.

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1929 L. F. Stone Out of Void in Amazing Stories Aug. 454/1 Directly behind us lay the Sun, a great flaming ball that was blinding. A little to the left, appearing as large though not as bright as old Sol, was Mother Earth.
1931 N. Schachner & A. L. Zagat in Wonder Stories Apr. 1229/2 There's Orion, there's Cassiopeia, there's Lyra, there's Old Sol! We're home again.
1932 J. W. Campbell Invaders from Infinite in Amazing Stories Q. Spring 211/1 There were twelve gigantic worlds, each far larger than Jupiter of Sol, and larger than Stwall of Talso's sun, Renl.
1935 ‘D. A. Stuart’ in Astounding Stories Oct. 13/2 That was Earth. And it was old Sol. Old–old Sol. It was the time axis that coil distorted, not gravity at all.
1935 J. W. Campbell Jr. Night in T. Shippey Oxf. Bk. Sci. Fiction (1992) 101 That was Earth. And it was old Sol.
1942 J. W. Campbell Supernova Centaurus in Astounding Sci. Fiction Feb. 6/2 We've considered what might happen if Sol itself went nova. If it should go supernova, no worse could happen; Earth and all life on it would be fused and volatilized in either case.
1944 Astounding Sci.-Fiction Mar. 46/2 The sun was a huge, irregular disk of flaming yellow that had peculiar, symmetrical streamers flowing off; twelve of the main ones and a constant opening and closing twenty-four minor streamers that flowed outward from the duodecagonal pattern of Sol.
1944 ‘W. Long’ Nomad in Astounding Sci. Fiction Dec. 21/2 We are close to Sol. A light-week or less.
1949 R. A. Heinlein Red Planet (1968) end papers Mars , fourth planet in the system of Sol.
1952 H. B. Piper Uller Uprising (1983) xi It is the second planet of the star Beta Hydri, right angle 0:23, declension -77:32, G-0 (solar) type star, of approximately the same size as Sol; distance from Earth, 21 light years.
1953 ‘A. Norton’ Star Rangers (1985) 198 ‘Terra of Sol.’ He read it aloud and the three words seemed to echo more loudly down the hall than any of the shouted names of the kindred stars. ‘Terra of Sol–man's beginning!’
1965 E. E. Smith Triplanetary 189 Finally, their most pressing questions answered, they turned their most powerful ultra-beam communicator towards the yellowish star which they knew to be Old Sol.
1974 A. D. Foster Dark Star (1978) 11 But they couldn't chance letting one of those planet-busters back into Old Sol's backyard.
1983 D. Brin Startide Rising 81 The great cylinder was only twenty meters across. The vista wasn't as impressive as the view from the hub of one of the space cities of Sol's asteroid belts.
1987 N. Spinrad Little Heroes (1989) 24 That was just what he had been doing for these past eight days, but mostly up in midtown, where the Line between sombre and sol was clearly drawn by the city cops ?
1988 C. J. Cherryh Cyteen 42 Mars, fourth planet of Sol system.
1989 J. M. Dillard Lost Years vi.136 They're over two hundred sols old.
1990 A. McCaffrey & J. L. Nye Death of Sleep (1992) 167 Partly because of the Admiral's influence, but also because it is convenient to our mission, we're going to Alpha Centauri, then toward Sol.
1991 K. Laumer Judson's Eden 54 Figures: made out of the same gas cloud as Sol and the System.
1992 B. Bova Mars (1993) 22 To avoid confusion, space explorers refer to the Martian day as a ‘sol’. In one Martian year, there are 669 sols, plus an untidy fourteen hours, forty-six minutes and twelve seconds.