Waning three-quarter Moon — relief in grazing light
A three-quarter Moon is the hour of shadows. Along the day-night boundary, the terminator, sunlight strikes the surface so obliquely that every crater rim, every mountain range and every fault scarp casts a long shadow. Brightness becomes relief: the same landscape that looks flat and white at full Moon stands here as modeled as a model in the grazing light of a desk lamp. Why the illumination decides what a lunar photograph shows at all is explained in the Moon article in the knowledge section.
According to the embedded timestamp, the panorama was taken on October 7, 2012 at 02:18: a waning Moon at 62.6 percent illumination, on its way to last quarter — a phase that belongs to the second half of the night. The image has south at the top, the way the Newtonian shows the Moon.
The dark maria are giant impact basins flooded with basalt, the bright highlands the older, more densely cratered primordial crust. Along that night's terminator lie showpieces of both worlds: the arc of Mare Imbrium with the Apennines, dark Plato, the crater labyrinth around Clavius. The crops work through them in order.
That the view changes slightly from month to month we owe to libration: through its tidally locked rotation the Moon always turns the same side toward us, yet it wobbles a little — over many months about 59 percent of the surface becomes visible in total, and the foreshortened limb zones tip toward us now more, now less.
All labels are computed, not placed by eye: the image was geometrically registered against the NASA reference for the same night, and the names follow the official USGS/IAU nomenclature. Details are given under "Capture and processing".
Crops
Clavius
Clavius at the terminator — the classic among test objects
Clavius, some 231 kilometers across, is one of the largest craters on the lunar near side, and right at the terminator it shows its trademark: the curving chain of interior craters that sweeps across its floor in decreasing size — for generations a favorite test of telescope and steady air.
A little farther toward the limb stands Moretus, whose central peak casts a long shadow in the grazing light. All around crowd the southern highlands, rampart against rampart — the oldest, most densely battered landscape on this side of the Moon.
Mare Imbrium
Mare Imbrium — a view across an entire ring of mountains
Mare Imbrium is the lava fill of one of the Moon's largest impact basins, a good 1,100 kilometers across — and this crop shows it almost in its entirety: the dark plain, with lava-flooded Archimedes in it, Eratosthenes at its edge, and as a setting the great arc of the Montes Apenninus, the basin rim left standing.
At the foot of the mountains lie Palus Putredinis with Rima Hadley — the Apollo 15 site — as well as Mons Huygens and Mons Bradley; from the other side Montes Carpatus, Montes Caucasus and Promontorium Laplace reach into the field. A single impact, and everything here is its consequence.
Plato & Alps
Plato — the dark crater with the polished floor
Plato stands out in every lunar phase: its floor, some 101 kilometers across, is filled with unusually dark lava and is so level that it looks polished — the few tiny craterlets on it are classic touchstones for good optics and steady air. In grazing light the jagged rim throws long teeth of shadow across the smooth surface.
Adjoining it are the Montes Alpes, whose crest is cut through by the Vallis Alpes — caught only at the edge of this crop. Crater, mountains and valley all belong to the northern rim of the Imbrium basin.
Maurolycus & Stöfler
Maurolycus and Stöfler — stratigraphy with nothing but shadows
Maurolycus is a veteran: its rampart is broken up, overprinted, riddled with younger impacts — every scar a later event on an ancient surface. Right beside it lies the large walled plain Stöfler, whose floor stayed smoother but whose rim was punched through as well.
Between the two there is hardly a surface that something has not struck at some point. The grazing light makes the sequence readable: whoever shatters whose rampart is the younger — relative dating with nothing but shadows.
Abulfeda & Sacrobosco
Catena Abulfeda — a string of pearls made of secondary craters
The Catena Abulfeda runs as a strikingly straight chain of small craters more than 200 kilometers across the highlands. Such chains are usually taken to be secondary craters: chunks flung out by a large impact that came back down in rapid succession — one impact that made further impacts.
The old, repeatedly overprinted Sacrobosco forms the second anchor point. Mare surfaces are entirely absent here; this is pure southern highlands, in which every generation of craters lies on top of the previous one.
Copernicus & Stadius
Copernicus, Eratosthenes, Stadius — three craters, three fates
Three craters, three fates: Copernicus, young and deep, with terraced walls, central peaks and a bright ejecta blanket. Eratosthenes, older, still entirely intact, but without rays. And Stadius, which the Imbrium lava has drowned down to a low, gap-toothed ring.
Seeing them side by side in one and the same field is a crash course in lunar history — impact, aging, flooding. Mare Insularum and the spur of the Montes Carpatus tie the three into one coherent scene.
Abulfeda & Descartes
Highlands near Descartes — where Apollo 16 got it wrong
Between Abulfeda and Descartes lies unspectacular but informative terrain: bright, hilly highlands without a single mare surface. In grazing light even low, almost leveled ramparts stand out that vanish without a trace into uniform gray when the Sun is high.
It was in exactly this kind of landscape, a little north of Descartes, that Apollo 16 landed — expecting to sample volcanic highlands. What came back instead were impact breccias: the highlands are rubble through and through.
Apennines & Hadley
Montes Apenninus and Rima Hadley — mountains made in an instant
The Montes Apenninus are not a mountain range that grew, but the thrown-up rim of the Imbrium impact — piled up in minutes, unchanged for billions of years. Mons Huygens and Mons Bradley rise out of the front; the grazing light separates summits, slopes and the mare basalt in front of them with knife-edge sharpness.
At the foot of the range, at Palus Putredinis, winds Rima Hadley — a volcanic channel, presumably a collapsed lava tube. On the narrow strip between rille and mountain front Apollo 15 landed in 1971 and drove the first lunar rover right up to the edge of the rille.
Caucasus & Aristoteles
Montes Caucasus and Aristoteles — the bridge between two basins
The rugged Montes Caucasus are the causeway between two giant basins: here the ring ramparts of Imbrium and Serenitatis merge into one another. North of them stands Aristoteles, whose sharply drawn rampart sets it clearly apart from the restless mountain landscape.
At the edge of the field the dark Lacus Mortis appears — a "lake of death" that, soberly considered, is a small lava-filled basin. The crop marks the transition: here the world of the great seas ends, and beyond it the cratered north begins.
Byrgius & western limb
Byrgius A — a ray center on the western limb
Close to the western limb lies an inconspicuous crater with a big entrance: Byrgius A, a young impact on the rampart of the older Byrgius, whose ray system fans out over the surrounding country like a bright starfish. Rays are freshly ejected material that has not yet darkened — the signature of the youngest impacts.
In the same field lie Mersenius, with its arched floor cut by rilles at the western edge of Mare Humorum, and Vieta. Young and bright next to old and dark — on the western limb the albedo reads like an age scale.
Schickard & Wargentin
Schickard, Schiller, Wargentin — three walled plains, three floors
Three large craters, three completely different floors: the 212-kilometer walled plain Schickard, elongated Schiller — and between them the curiosity Wargentin, a crater filled with lava almost to the brim, which therefore stands above its surroundings as a raised slab: a mesa of basalt.
All of it lies in the strongly foreshortened limb zone of the southwest. Here the grazing light rescues the forms that the high Sun of the near-full-Moon entry flattens away.
Tycho to Bullialdus
From Tycho to Bullialdus — rays across Mare Nubium
A cross-section through the southwest: at the top Tycho with its central peak, whose bright rays run right across the dark Mare Nubium, along with the huge, shallow Deslandres, basalt-filled Pitatus at the edge of the mare and terraced Bullialdus.
The rays tell the sequence: they lie on top of everything else — on highlands, mare and older craters. What lies on top came last; at about 100 million years, Tycho is one of the youngest major events on this side of the Moon.
Kepler
Kepler — a small crater with a large halo of rays
Kepler is only a good 30 kilometers across and yet dominates its whole surroundings: its halo of rays covers the dark mare far and wide and gives away the young impact. Under this illumination — the Sun already high — hardly anything of the crater relief is visible, but the rays are all the more distinct.
Where Kepler's rays cross those of Copernicus and Aristarchus, the bright net arises that gives Oceanus Procellarum its markings at full Moon.
Aristarchus
Aristarchus — the brightest spot on the Moon
Aristarchus is the brightest larger spot on the entire lunar near side — so conspicuous that it has repeatedly been taken for activity. In fact it is simply very young: its freshly thrown-up material has not yet had time to darken under the particle bombardment of the solar wind.
With the Sun high it becomes a pure source of light without relief. The contrast with the surrounding dark Oceanus Procellarum is so great that it can still be made out even in the ashen earthshine of a new Moon.
Directly north of it the overlays mark the Vallis Schroteri and parts of the Montes Agricola: crater ejecta, a volcanically shaped plateau and dark mare basalt meet here in a small space.
North polar region
The north polar region — W. Bond, Goldschmidt and Meton in grazing light
At the northern edge the day-night boundary runs through the image, and the strongly foreshortened polar region puts on its whole show: the old, shallow giant craters W. Bond, Goldschmidt and Meton lie half in complete night while their ramparts still glow; individual mountain summits stand as islands of light in the black.
The shadows are measuring instruments here: from their length and the elevation of the Sun the height of every rampart can be calculated — this is exactly how observers since Galileo determined the first mountain heights on another celestial body.
Acquisition and processing
The image comes from this gallery's early Newtonian period: a GSO 8″ f/4 Newtonian with 800 mm focal length, extended with a Tele Vue 2.5× Barlow, and in front of it an ALCCD full-HD planetary camera. The Moon was recorded as video sequences; lucky imaging was used to select and average the sharpest moments, and the individual fields were then assembled in Adobe Photoshop into this panorama of 4,116 × 6,174 pixels. Today's AVIF version was output in 2026 from Photoshop/Camera Raw as a 10-bit HDR image in Rec. 2020 PQ.
The overlay uses a NASA reference view with the phase, libration and axis orientation of the night of capture (October 7, 2012, 00:00 UT). 268 geometrically consistent image matches register this reference directly onto the panorama, with a median residual of 4.25 pixels; the official coordinates from the USGS/IAU Gazetteer of Planetary Nomenclature are then projected into the image. The procedure serves reliable naming — it is not a photogrammetric height measurement.