What Is Greatest Elongation?
Venus orbits the Sun inside Earth's orbit, which means it never appears far from the Sun in our sky. On most nights, Venus is either lost in the twilight glow — too close to the Sun to be seen — or rises just before dawn.
Greatest elongation is the moment when Venus reaches its maximum angular separation from the Sun. On June 1, 2026, Venus will be 45.9 degrees east of the Sun — its eastern greatest elongation, meaning it appears in the western evening sky after sunset, at its maximum distance from the Sun for this apparition.
At this moment, Venus will be blazing at magnitude -4.5: the brightest natural object in the sky besides the Moon. It will be visible for several hours after sunset. It will cast a faint shadow. Under very dark skies, it can be seen in broad daylight by anyone who knows exactly where to look.
Why Venus Shows Phases
Venus, like the Moon, goes through phases — and through a small telescope, you can see them with your own eyes.
This is because Venus orbits inside Earth's orbit. When it's on the far side of the Sun from us, it appears fully illuminated (like a full Moon) but tiny — it's at its greatest distance. As it moves around to the near side, it grows larger but becomes a thinner crescent, because we're seeing more of its night side. At greatest elongation, Venus appears as a half-disc — exactly half illuminated, exactly half in shadow.
Galileo Galilei first observed the phases of Venus in 1610. This was a crucial observation: the geocentric model of the solar system (with Earth at the centre) could not produce the full range of Venusian phases that Galileo observed. The fact that Venus showed a "full" phase, like the Moon, meant it had to be on the far side of the Sun at some point — which was only possible if it orbited the Sun, not Earth. The phases of Venus were one of Galileo's strongest pieces of evidence for the heliocentric model.
How to Find Venus
You cannot miss it. Look west after sunset and find the brightest object in the sky. Venus will be there, burning steadily without twinkling, hours after the Sun has set. In June 2026, it will reach its highest point in the western sky roughly 2–3 hours after sunset.
On the evening of June 1, Venus will set in the northwest at approximately 3–4 hours after sunset, depending on your latitude.
Observing Venus Through a Telescope
At greatest elongation, Venus is among the most rewarding objects for a small telescope:
The half-phase: The terminator — the sharp line dividing light from shadow — bisects the disc. Through a telescope, Venus looks almost exactly like a quarter Moon, but more brilliant and with a slightly orange or white tinge.
The disc: Venus's disc is approximately 24 arcseconds across at greatest elongation — large enough to show obvious disc structure in any telescope. The phase is immediately visible.
What you won't see: Cloud features. Venus's visible surface is the top of its dense cloud deck, which is largely featureless in visible light. In ultraviolet photography, subtle banding is visible. The clouds rotate in four Earth days, though the planet itself rotates in 243 days.
The atmosphere: Near the cusps (the tips of the crescent as Venus moves past elongation), you may notice a subtle brightening or "extending" of the horns — this is sunlight scattered through the thick Venusian atmosphere, visible as a faint arc extending beyond the actual terminator.
Historical Significance
Venus has been observed since prehistoric times — the first recorded naked-eye observation of Venus that can be reliably dated is Babylonian, around 1600 BCE (the Venus Tablet of Ammisaduqa).
The planet's two roles as "morning star" and "evening star" were recognised long before antiquity confirmed they were the same object. The ancient Greeks thought they were two different stars — Phosphorus (morning) and Hesperus (evening). Pythagoras (or possibly his followers) is credited with first recognising them as the same object.
In Norse mythology, the morning star was called Aurvandil's Toe — the Norse god Þórr (Thor) is said to have thrown it into the sky. In Aztec culture, Venus was Quetzalcóatl, and its heliacal rising — its first appearance after a period of invisibility — was associated with the return of the god and used to calibrate sacred calendars.
Photography Tips
Phone camera: Venus will photograph beautifully in the blue hour after sunset. Use night mode or manual: it's bright enough to photograph at low ISO (200–400), short exposure (1/60–1/250s), balanced against the twilight sky. A crescent Moon nearby makes the composition stunning.
DSLR with telephoto: 500mm+ at f/8, ISO 400, 1/100–1/500s. You'll capture the disc as a distinctly non-circular shape — the half-phase is visible.
Telescope + camera: Attach a camera or phone to the eyepiece. Venus's brightness means you need a neutral-density filter or very short exposures to avoid saturation. Capture the clear half-disc phase.
One Surprising Fact
Despite being called the "Evening Star," Venus is bright enough to read by in very dark conditions. Sailors have been misled by it into reporting it as an approaching ship. The US military reportedly shot at Venus several times during the Cold War, mistaking it for a Soviet aircraft.