the side of a planet or moon that is in daylight, sometimes in the context of a planet with one side permanently facing its sun
The day side of the Moon is exposed to the Sun’s intense heat for a fortnight at a stretch, the temperature rising very high, probably reaching the boiling point, whilst through the long lunar night of a fortnight, the surface freezes in the icy cold, the temperature of the night side of the Moon falling very low, perhaps to 200 or 250 below zero.
Call of Stars 334
1935 Astounding Stories Feb. 69
It was not known then that while the night-side life of Venus can eat and digest that of the day side, the reverse is not true. No day-side creature can absorb the dark life because of the presence of various metabolic alcohols, all poisonous.
Artificial lighting is rare on Venus, which never knows true darkness on Dayside.
There Shall Be Darkness in Astounding Science-Fiction Feb. 20/2
Out there in the darkness—and on the day-side of Earth, too—something was gnawing at that empire, as mice might gnaw at the strands of some vast net.
Gather, Darkness! 101
The Thunderer went up, came down four hundred miles within the night-side. The tactic, decided Leigh, represented a right smart piece of figuring. Aroused aliens on the day-side would now require about twelve days to reach them.
Waitabits in Astounding Science Fiction July 73/1
But damn it, there’s Dayside life, too. Life that never comes into Twilight.
Life Cycle in Magazine of Fantasy & Science Fiction July 55/2
Male and female had to come from the same race, evolving together—they couldn’t have arisen separately, one in the hell of Dayside and one in the endless purgatorial dusk of Twilight.
Life Cycle in Magazine of Fantasy & Science Fiction July 65/2
But our beam is fixed on Lucifer, so we can only see them for a few minutes while they're in transit. And your Mount Zeus is just on the dayside—so it’s always hidden then.
2061: Odyssey Three 55
We will not shelter our awareness on dayside.
Harvest of Stars (1994) 1
Kirk shook his head in wonderment, turning back toward where the roiling black mass was quickly obscuring a large swath of the planet’s dayside.
Firestorm i. 2
I watched as the nightside part of Earth—lenticular in this perspective, like a cat’s black pupil abutting the blue crescent of the dayside—kissed the gray lunar horizon.
Mindscan xiii. 89
John R. Kippax, 'The Call of the Stars'
Research HistoryFred Galvin submitted a cite from a 1951 reprint of C.L. Moore's 1942 "There Shall Be Darkness", which Mike Christie verified in its 1942 first publication.
Ralf Brown submitted cites from a 1989 reprint of Arthur C. Clarke's "2016: Odyssey Three", which Mike Christie verified in the 1988 first edition.
From his etext collection, Ralf Brown suggested Fritz Leiber's "Gather, Darkness", and Douglas Winston submitted a cite from a 1969 reprint, which Mike Christie located in the 1950 first book publication.
Fred Galvin submitted a cite for "day-side" from a 1964 reprint of Eric Frank Russell's "The Waitabits", which Mike Christie verified in its 1955 first publication.
Fred Galvin submitted a cite for "day side" from a book copyrighted in 1951, "Men of Other Planets" by Kenneth Heuer.
Fred Galvin submitted a cite for "day side" from a 1949 reprint of Stanley G. Weinbaum's "Parasite Planet": we would like to verify this in its first publication (Astounding Stories, February 1935). This source also used "day-side" as an adjective.
Fred Galvin submitted a 1957 cite from Poul Anderson's "Life Cycle"
Fred Galvin submitted a 1914 cite for "day side" from John R. Kippax's "The Call of the Stars"
Last modified 2022-03-28 19:15:00
In the compilation of some entries, HDSF has drawn extensively on corresponding entries in OED.