Let’s take a look at a handful of H. P. Lovecraft’s many mentions of the moon.

1. At the Mountains of Madness. Had it been some trace of that bizarre musical piping over a wide range which Lake’s dissection report had led us to expect in those others—and which, indeed, our overwrought fancies had been reading into every wind-howl we had heard since coming on the camp horror—it would have had a kind of hellish congruity with the aeon-dead region around us. A voice from other epochs belongs in a graveyard of other epochs. As it was, however, the noise shattered all our profoundly seated adjustments—all our tacit acceptance of the inner antarctic as a waste as utterly and irrevocably void of every vestige of normal life as the sterile disc of the moon. What we heard was not the fabulous note of any buried blasphemy of elder earth from whose supernal toughness an age-denied polar sun had evoked a monstrous response. Instead, it was a thing so mockingly normal and so unerringly familiarised by our sea days off Victoria Land and our camp days at McMurdo Sound that we shuddered to think of it here, where such things ought not to be. To be brief—it was simply the raucous squawking of a penguin. 
2. The Call of Cthulhu. There is a sense of spectral whirling through liquid gulfs of infinity, of dizzying rides through reeling universes on a comet’s tail, and of hysterical plunges from the pit to the moon and from the moon back again to the pit, all livened by a cachinnating chorus of the distorted, hilarious elder gods and the green, bat-winged mocking imps of Tartarus. Try to picture yourself on this dizzying ride… it’s terrifying. There’s no mention of blood or pain, but the sheer terror of being out of control in such an alien environment is surely worse! 
3. Celephaïs. Kuranes came very suddenly upon his old world of childhood. He had been dreaming of the house where he was born; the great stone house covered with ivy, where thirteen generations of his ancestors had lived, and where he had hoped to die. It was moonlight, and he had stolen out into the fragrant summer night, through the gardens, down the terraces, past the great oaks of the park, and along the long white road to the village. The village seemed very old, eaten away at the edge like the moon which had commenced to wane, and Kuranes wondered whether the peaked roofs of the small houses hid sleep or death. In the streets were spears of long grass, and the window-panes on either side were either broken or filmily staring. Kuranes had not lingered, but had plodded on as though summoned toward some goal. He dared not disobey the summons for fear it might prove an illusion like the urges and aspirations of waking life, which do not lead to any goal. Then he had been drawn down a lane that led off from the village street toward the channel cliffs, and had come to the end of things—to the precipice and the abyss where all the village and all the world fell abruptly into the unechoing emptiness of infinity, and where even the sky ahead was empty and unlit by the crumbling moon and the peering stars. Faith had urged him on, over the precipice and into the gulf, where he had floated down, down, down; past dark, shapeless, undreamed dreams, faintly glowing spheres that may have been partly dreamed dreams, and laughing winged things that seemed to mock the dreamers of all the worlds. Then a rift seemed to open in the darkness before him, and he saw the city of the valley, glistening radiantly far, far below, with a background of sea and sky, and a snow-capped mountain near the shore. The moon doesn’t seem to be in very good shape in this beautifully poetic paragraph! 
4. The Colour out of Space. Then, when it was seen that nothing further could be gained from the well, everyone went indoors and conferred in the ancient sitting-room while the intermittent light of a spectral half-moon played wanly on the grey desolation outside. The men were frankly nonplussed by the entire case, and could find no convincing common element to link the strange vegetable conditions, the unknown disease of livestock and humans, and the unaccountable deaths of Merwin and Zenas in the tainted well. They had heard the common country talk, it is true; but could not believe that anything contrary to natural law had occurred. No doubt the meteor had poisoned the soil, but the illness of persons and animals who had eaten nothing grown in that soil was another matter. Was it the well water? Very possibly. It might be a good idea to analyse it. But what peculiar madness could have made both boys jump into the well? Their deeds were so similar—and the fragments shewed that they had both suffered from the grey brittle death. Why was everything so grey and brittle? 
5. The Curse of Yig. And beyond it all, waking a hideous thought, the monotonous beating of the distant tom-toms came incessantly across the black plains on which a cloudy half-moon had set. 
6. The Dream-Quest of Unknown Kadath. It was sunset now, so Carter stopped at an ancient inn on a steep little street overlooking the lower town. And as he went out on the balcony of his room and gazed down at the sea of red tiled roofs and cobbled ways and the pleasant fields beyond, all mellow and magical in the slanted light, he swore that Ulthar would be a very likely place to dwell in always, were not the memory of a greater sunset city ever goading one on toward unknown perils. Then twilight fell, and the pink walls of the plastered gables turned violet and mystic, and little yellow lights floated up one by one from old lattice windows. And sweet bells pealed in the temple tower above, and the first star winked softly above the meadows across the Skai. With the night came song, and Carter nodded as the lutanists praised ancient days from beyond the filigreed balconies and tessellated courts of simple Ulthar. And there might have been sweetness even in the voices of Ulthar’s many cats, but that they were mostly heavy and silent from strange feasting. Some of them stole off to those cryptical realms which are known only to cats and which villagers say are on the moon’s dark side, whither the cats leap from tall housetops, but one small black kitten crept upstairs and sprang in Carter’s lap to purr and play, and curled up near his feet when he lay down at last on the little couch whose pillows were stuffed with fragrant, drowsy herbs. Before starting this post, it took me a while to decide between Lovecraft’s mentions of cats or his descriptions of the moon.  Disclaimer: Examining the Odd does not condone the strapping of rockets or anything else to cats.
7. The Festival. We went out into the moonless and tortuous network of that incredibly ancient town; went out as the lights in the curtained windows disappeared one by one, and the Dog Star leered at the throng of cowled, cloaked figures that poured silently from every doorway and formed monstrous processions up this street and that, past the creaking signs and antediluvian gables, the thatched roofs and diamond-paned windows; threading precipitous lanes where decaying houses overlapped and crumbled together, gliding across open courts and churchyards where the bobbing lanthorns made eldritch drunken constellations. Ok, so this mentions a lack of the moon, but that’s just as scary as a glowing moon. 
8. He. My coming to New York had been a mistake; for whereas I had looked for poignant wonder and inspiration in the teeming labyrinths of ancient streets that twist endlessly from forgotten courts and squares and waterfronts to courts and squares and waterfronts equally forgotten, and in the Cyclopean modern towers and pinnacles that rise blackly Babylonian under waning moons, I had found instead only a sense of horror and oppression which threatened to master, paralyse, and annihilate me.
9. Herbert West – Reanimator. So we both went down the stairs on tiptoe, with a fear partly justified and partly that which comes only from the soul of the weird small hours. The rattling continued, growing somewhat louder. When we reached the door I cautiously unbolted it and threw it open, and as the moon streamed revealingly down on the form silhouetted there, West did a peculiar thing. Despite the obvious danger of attracting notice and bringing down on our heads the dreaded police investigation—a thing which after all was mercifully averted by the relative isolation of our cottage—my friend suddenly, excitedly, and unnecessarily emptied all six chambers of his revolver into the nocturnal visitor. 
10. The Horror at Martin’s Beach. It was in the twilight, when grey sea-birds hovered low near the shore and a rising moon began to make a glittering path across the waters. It’s one of my favourite things to see the moon above the sea at night. I’m lucky enough to live in a coastal town, but I don’t go to watch this spectacle nearly enough. Thank you for the reminder Lovecraft.