By Chris Deziel | Updated March 24, 2022
Venus is Earth's closest planet and the one most similar to us in size. Because it orbits so close to the Sun, it is the brightest non‑stellar object in the night sky, often called the morning or evening star depending on the time of its appearance.
Venus never strays farther than 48° from the Sun. Its maximum altitude is only about 46°, so it always appears near the horizon. During the day it rises above the mid‑heaven, but the Sun outshines it, making it invisible until after sunset or before sunrise.
When the planet’s angular separation from the Sun exceeds roughly 5°, it can be seen for a little under three hours after sunset (as the evening star) or before sunrise (as the morning star). The exact time and side of the Sun on which Venus appears depends on its position in its orbit.
Consult a current sky chart or a mobile app such as Sky Guide. These tools use your GPS to display the sky in real time and show Venus’s elongation from the Sun. If the separation is greater than 5°, you should be able to spot it shortly after dusk or before dawn. If it is less, the planet will be lost in the Sun’s glare.
Venus’s brightness is a combination of its large size, close distance to Earth, and an exceptional albedo of 0.75—more than double Earth’s 0.30. The thick cloud cover reflects a large portion of sunlight, making Venus the third brightest object in the sky after the Sun and Moon.
Unlike the Moon, Venus does not appear brightest when fully illuminated. Its maximum brightness occurs when it is a few days past or before its maximum elongation, when it is still only partially illuminated and at its closest approach to Earth.
While no lander has touched its surface, several orbiters have studied the planet:
Venus’s atmosphere is rich in CO₂ and dominated by sulfuric acid clouds. The planet’s surface pressure is about 90 × Earth’s, and temperatures reach 870 °F (465 °C). Solar wind continuously strips hydrogen from the day side, contributing to the loss of any primordial water and reinforcing the runaway greenhouse effect—an extreme example that serves as a cautionary benchmark for Earth’s climate.
Venus rotates retrograde, so the Sun rises in the west and sets in the east. A Venusian day lasts 243 Earth days—longer than its year of 224 Earth days—so one could experience either a sunrise or a sunset, but not both, in a single rotation. The surface is covered with basaltic plains punctuated by volcanoes, lava flows, and “crowns”—ring‑shaped structures up to 360 km wide. The environment is hostile, with temperatures high enough to melt lead and pressures that would crush an unprotected human.
In short, while Venus is a breathtaking celestial object to watch, its surface is a forbidding, volcanic landscape far removed from Earth.
