the side of a planet 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.
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.
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.
The night side of the planet is a land of awful cold and darkness. Here is where the sun never rises and the stars always shine. A traveler coming from the day side of the planet would probably be regarded as a lunatic if he attempted to describe the luminary above his land; the sun would be beyond the experience of natives of the night side. Not only is Mercury the spot of the greatest heat in the planetary system, it is also probably colder than the outermost planets, such as Uranus or Neptune.
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.
But damn it, there’s Dayside life, too. Life that never comes into Twilight.
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.
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.
We will not shelter our awareness on dayside.
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.
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.
John R. Kippax, 'The Call of the Stars'
Last modified 2021-01-09 23:11:22
In the compilation of some entries, HDSF has drawn extensively on corresponding entries in OED.