How Big Does the Sun Look From Each Planet?

Compare the Sun's Size From Every Planet

Choose a planet or adjust the distance to see how the Sun's apparent size changes across the solar system. Both squares use the same angular scale, including on mobile. Pluto is included as a dwarf planet alongside the eight planets.

How Big Does the Sun Look From Each Planet?

The table uses the same calculation as the simulator. The reference distances are rounded for display, while calculations retain their stored precision. One degree contains 60 arcminutes, shown with a prime symbol (′). Earth’s reference is exactly 1 astronomical unit, or 149,597,870.7 kilometers.

A semimajor axis describes the size of an elliptical orbit. It is a convenient stable reference, not the distance on a particular day or an exact time-average distance. To explore the changing configuration, see where the planets are right now.

What Would the Sun Look Like From Mercury?

At Mercury’s reference distance of about 0.387 AU, the Sun spans approximately 1.377°. That is about 2.58 times the diameter of the solar disk at 1 AU, and about 6.67 times its apparent disk area. “Times larger” needs a definition: width and area are different comparisons.

Mercury’s orbit is notably elliptical. Near perihelion, its closest approach to the Sun, the disk is larger than this reference; near aphelion, it is smaller. Its roughly 0.31–0.47 AU orbital distance range explains why a single number cannot describe every Mercury view. Try those distances in the number box rather than treating the preset as a constant observed size.

Mercury’s tenuous exosphere does not behave like Earth’s thick atmosphere, but this diagram still omits terrain, spacecraft windows, glare, and viewing equipment. It compares the underlying angular geometry.

What Would the Sun Look Like From Venus?

Venus’s reference distance, about 0.723 AU, gives a solar diameter of approximately 0.737°. The disk is about 1.38 times Earth’s reference diameter. Its nearly circular orbit produces a smaller fractional distance change than Mercury’s, although the real distance is not perfectly constant.

This does not mean a person on Venus’s surface would see the clear, sharply defined circle drawn here. Venus has an extremely dense atmosphere and thick cloud cover. Scattering and absorption change the illumination below those clouds. The simulator represents an unobstructed theoretical viewpoint at Venus’s solar distance, not a surface photograph.

What Would the Sun Look Like From Mars?

At about 1.524 AU, the Sun from Mars spans approximately 0.350°, or 21.0 arcminutes. Its apparent diameter is about 65.6% of the Earth reference, while its apparent disk area is about 43.1%. The two percentages differ because area depends on the square of diameter.

Mars also follows an elliptical orbit, so this is a reference rather than a daily forecast. Martian dust and atmospheric scattering can affect the disk’s contrast, color, and surrounding sky. Those effects are separate from the center-to-center distance calculation. The simulator keeps disk styling consistent so the scale comparison remains clear.

What Would the Sun Look Like From Jupiter and Saturn?

At Jupiter’s reference distance of about 5.203 AU, the Sun spans roughly 0.102°, about one-fifth of Earth’s reference diameter. At Saturn’s roughly 9.537 AU reference distance, it spans about 0.056°, close to one-tenth. Their wide orbits substantially reduce the angular width of the same star.

Jupiter and Saturn have no solid surface on which an observer could stand. These comparisons use a theoretical solar distance corresponding to each planet’s center, as a geometric reference only. A spacecraft near a planet, a cloud-top view, and a view from one of its moons would have different observing circumstances. We do not model those environments or a particular moon’s position.

What Would the Sun Look Like From Uranus and Neptune?

The Sun spans about 0.0278° at Uranus’s reference distance and 0.0177° at Neptune’s. Neptune’s value is roughly 1.06 arcminutes, compared with nearly 32 arcminutes at Earth’s reference. The solar disk’s diameter is therefore about one-thirtieth as large.

A small angular diameter does not tell you exactly how an unaided human eye would perceive the Sun. Vision, glare, filters, optics, and atmospheric conditions all matter. The simulator deliberately avoids turning the distant Sun into an enlarged decorative orb: its small disk uses the same scale as Earth’s.

Uranus and Neptune are ice giants without an Earth-like solid observing surface. Their presets describe theoretical solar distances, not an accessible place to stand. The dark background also does not predict how their real skies would look.

What Would the Sun Look Like From Pluto?

At Pluto’s fixed reference distance of 39.482 AU, the Sun spans about 0.0135°, or 0.81 arcminutes. Its apparent diameter is about 2.53% of the Earth reference. The simulator draws that small disk on the same scale, without artificially enlarging it.

Pluto is a dwarf planet, included here as an additional comparison beyond the eight planets. Its elliptical orbit means the real solar distance varies substantially; this preset uses the mean J2000 semimajor axis listed in NASA’s Pluto Fact Sheet, rather than a current position. The pale icy horizon is a decorative motif, not a reconstruction of Pluto’s surface illumination.

Select Pluto in the simulator to compare the disks, or explore how much sunlight Pluto receives.

Why Does the Sun Look Smaller Farther Away?

Angular diameter measures how much of your field of view an object spans. Imagine holding a coin close to your face, then moving it farther away. Its physical diameter stays unchanged, but the angle between the lines of sight to its opposite edges decreases.

For the Sun at planetary distances, doubling the distance approximately halves its angular diameter. The approximation is excellent because even the largest solar disk in this tool occupies only a small angle. The simulator calculates the angle rather than assigning a decorative circle size to each planet.

This is the flat-disk angular-size approximation. The exact limb geometry of a spherical Sun uses 2 × arcsin(R/d). Across this tool’s 0.3–50 AU range, the difference is below 0.013%, much smaller than the precision useful for this screen comparison.

Each square represents a fixed 2.4° width. A circle’s diameter is proportional to its calculated angle, without a minimum-size boost for distant planets. Your screen size and viewing distance are not calibrated, so the display compares angular sizes; it does not reproduce their actual visual angles at your eyes.

Does a Smaller Sun Mean Less Sunlight?

Compare calculated energy per square meter in the Sunlight Intensity Simulator for all eight planets and dwarf planet Pluto, with solar irradiance in W/m² and an interactive distance graph.

Greater distance also reduces incoming solar energy per unit area. For an unobstructed detector facing the Sun, irradiance approximately follows the inverse-square law: relative sunlight is 1/d² when d is expressed in AU. Twice the distance means about one-quarter the energy per unit area; half the distance means about four times as much.

Apparent diameter, apparent disk area, and irradiance remain separate concepts. Disk area approximately follows the inverse square of distance because angular diameter approximately follows its inverse. Irradiance follows from energy spreading across a growing sphere. Their similar scaling does not make an image-area measurement a measurement of received energy.

At Neptune’s reference distance, this simple energy comparison is about 0.11% of the 1 AU value, before any atmospheric absorption. The simulator does not dim your screen by that factor or predict a planet’s temperature. Atmospheres, reflectivity, geometry, rotation, and internal heat also affect a planet’s environment.

Explore the Geometry Behind the View

Distance also sets the time sunlight spends in transit. Compare how long sunlight takes to reach each planet with the animated light-travel simulator.

The Sun’s physical size, its angular size, and the energy arriving at a planet answer different questions. Compare distances here, then use the interactive Solar System Map to put those distances into orbital context.

Sources and method

• NASA Pluto Fact Sheet — Pluto’s mean J2000 semimajor axis, 39.48168677 AU; Pluto is a dwarf planet.
• IAU 2015 Resolution B3: nominal solar and planetary quantities — nominal solar radius.
• IAU resolutions on reference systems — the exact astronomical unit.
• JPL approximate planetary elements — J2000 semimajor-axis references, shared with Celesiq’s orbit model.
• NASA Venus facts and NASA Neptune facts — atmospheric and distance context.

Never use an unfiltered view of the real Sun to check this diagram. This simulator is an educational illustration, not a guide to safe solar observation.