What is Pluto Time?

Pluto sits billions of kilometres from the Sun, so you might picture its daytime as pitch black. It isn't. At high noon on Pluto there's still enough sunlight to read a book, walk around and see colours, although it's far dimmer than a sunny afternoon here.

Once in the morning and once in the evening, the light outside your window drops (or climbs) to exactly that level. That moment is called Pluto Time. NASA came up with the idea in 2015, in the run-up to the New Horizons flyby, and called the campaign Find Your Pluto Time, inviting people everywhere to step outside and take a photo. It's a lovely way to feel how far away the outer solar system really is, using nothing but your own eyes.

In practical terms, Pluto Time on Earth falls a little after sunset and a little before sunrise, when the Sun has just slipped below the horizon. The sky is still glowing, streetlights are flickering on, and the world has that soft, shadowless look. That's what the brightest part of a Plutonian day looks like.

The original NASA Pluto Time page is now archived, which is one reason we built our own Pluto Time calculator — a free NASA-inspired Pluto calculator that works for any place on Earth, gives you both the dawn and dusk times, and adds a few extras NASA's version never had.

How to use the Pluto Time Calculator

You'll have your answer in under ten seconds. Here's the whole process.

1. Choose your placeType a town or city into the search box and pick it from the list that appears. If you'd rather not type, tap the location button beside the search box and allow your browser to share your position.
2. Check the dateIt's set to today by default. Change it if you want to plan ahead for a trip, a photo shoot or a special day.
3. Confirm the time zoneThis fills in automatically when you search a place. You only need to touch it if you typed coordinates by hand.
4. Adjust the extras (optional)Open More settings if you want to change the sky conditions, your elevation, the clock format or Pluto's distance. Most people can skip this.
5. Press "Find my Pluto Time"Your next Pluto Time appears at once, with a live countdown, both dawn and dusk times, a graph of the Sun's path and a set of extra facts about your day.

Want to start again? Press Change details at the bottom of the results. It resets everything back to the starting view so you can try a different place or date.

Every feature explained

The calculator looks simple, but there's quite a lot going on under the bonnet. Each input has a small ? button beside it that explains it in one or two lines. Here's the fuller version.

The place search

Latitude and longitude

Date and time zone

More settings

These are tucked away because most people won't need them, but they're there if you want full control.

How to read your results

Once you press the button, the results panel slides into view. Here's what each part tells you.

Pluto Time around the world

Pluto Time happens everywhere on Earth, twice a day, but exactly when it lands depends heavily on your latitude. Near the equator the Sun drops almost straight down, so twilight is short and Pluto Time follows sunset within about eight minutes. Further from the equator the Sun slides down at a shallower angle, twilight stretches out, and the gap grows to fifteen minutes or more.

The gap also changes with the seasons. At higher latitudes it stretches out around the summer solstice, when twilight itself lingers for longer, and shrinks again in winter. This calculator gets visitors from well over sixty countries — Indonesia, Pakistan and India among the largest — and wherever you are, it works out today's exact figure for your own coordinates rather than an estimate from a table.

How bright is noon on Pluto?

Light is measured in lux, which tells you how much light lands on a surface. Direct summer sunshine on Earth is around 100,000 lux. A well-lit living room is a few hundred. Pluto's noon, at its 2026 distance, is roughly 100 lux.

That's about 1,270 times dimmer than direct sunlight at Earth, but around 300 times brighter than a full Moon. So how dark is it on Pluto? Dim, but not dark. Think of the soft glow just after sunset, not night.

You'll see various figures quoted online. NASA's own fact page describes the Sun at Pluto as about 1/900 as bright as at Earth, while other sources say "about a thousand times dimmer". Both are rounded. The real ratio depends on where Pluto is in its orbit, which brings us neatly to the next section.

Why Pluto's distance matters

Pluto's orbit is an oval, not a circle. It came closest to the Sun in 1989 and has been drifting outward ever since. Because light fades with the square of distance, a farther Pluto means a dimmer noon, which pushes Pluto Time a little deeper into twilight.

The science behind the calculator

If you've tried other tools, you may have noticed their answers don't agree. One uses a Sun angle of 1.5° below the horizon, another uses 2°, another nearly 5°, and at least one uses 6°. In practice, the difference between those can be twenty minutes or more. NASA never published the exact figure behind its original tool, so each site has simply picked a number.

We took a different route and worked it out from the physics in three steps:

1. Pluto's brightness. We find Pluto's real distance on your date from NASA JPL's orbital elements, then apply the inverse-square law to the Sun's known brightness. That gives Pluto's noon in lux.
2. The matching Sun angle. The US Naval Observatory publishes a well-tested model of how bright a clear sky is for any Sun position. We find the angle where Earth's twilight equals Pluto's noon. In 2026 it's about 2.7° below the horizon.
3. The exact clock time. NOAA's solar position equations (based on Jean Meeus's Astronomical Algorithms) find the precise second the Sun reaches that angle at your location, and your time zone rules turn it into local time.

What is solar noon?

Alongside Pluto Time, the results double as a free solar noon calculator: they show the moment the Sun is highest in your sky that day. It's rarely 12:00 on the clock. Daylight saving pushes it later by an hour when it's in effect, and the further west you sit within your time zone, the later it falls.

For example, on 24 September 2026 solar noon works out at 12:52 in London and about 13:15 in Belfast, simply because Belfast sits nearly six degrees further west despite sharing the same time zone. Wherever you are, enter your town and date to get the exact figure — useful for gardening, solar panels, photography and sundials alike.

How long is a day on Pluto?

This is one of the most common questions about Pluto, and the answer surprises people. One day on Pluto lasts about 153 hours, or 6 days, 9 hours and 17 minutes in Earth time (6.387 Earth days). So the length of a day on Pluto is more than six times ours.

Pluto also spins "backwards" compared with Earth. That's called retrograde rotation, and it means the Sun rises in the west and sets in the east. On top of that, Pluto's axis is tipped right over, so its poles spend decades in constant daylight or constant darkness.

There's one more oddity. Pluto and its largest moon, Charon, are locked facing each other. Pluto's day is exactly as long as Charon's orbit, so from one side of Pluto, Charon hangs in the same spot in the sky forever, and from the other side you never see it at all.

What time is it on Pluto right now?

There's no official clock on Pluto, so there's no single answer to "what time is it on Pluto?". It depends where on Pluto you're standing, just like on Earth. What you can do is experience its noon light from where you are, which is exactly what Pluto Time gives you.

How long does Pluto take to orbit the Sun?

Pluto takes about 248 Earth years to orbit the Sun (247.9 to be precise). It was discovered in 1930 and still hasn't completed a single lap since then. It won't finish its first full orbit since discovery until around 2178.

Because its orbit is so stretched, Pluto's distance swings between roughly 30 and 49 AU. From 1979 to 1999 it was actually closer to the Sun than Neptune was. The two never collide, because Neptune goes around exactly three times for every two Pluto orbits, which keeps them well apart.

How far away is Pluto?

Right now, in 2026, Pluto is about 35.6 AU from the Sun. That's roughly 5.3 billion kilometres, or 3.3 billion miles. One AU is the average distance between Earth and the Sun.

How many light minutes (or hours) away is Pluto?

Sunlight takes about 4 hours 56 minutes to reach Pluto at the moment — around 296 light minutes. At Pluto's closest it's about 4 hours 7 minutes, and at its farthest about 6 hours 50 minutes. For comparison, sunlight reaches Earth in just over 8 minutes.

How long would it take to travel to Pluto?

NASA's New Horizons probe left Earth on 19 January 2006 and flew past Pluto on 14 July 2015, a journey of about 9.5 years. It was one of the fastest spacecraft ever launched and even got a gravity boost from Jupiter along the way. A crewed trip with today's technology would take at least as long, and probably much longer if you wanted to slow down and stop.

Pluto temperature, day and night

Don't let the reading-light brightness fool you. Pluto is ferociously cold. NASA puts surface temperatures at about −226 to −240 °C (−375 to −400 °F). The difference between day and night is small, because 100 lux of sunlight carries very little warmth.

At those temperatures nitrogen, methane and carbon monoxide freeze solid. The bright heart-shaped region you can see on the calculator's Pluto, called Tombaugh Regio, is largely frozen nitrogen. The dark red patches are tholins, complex chemicals made when sunlight hits methane.

Tips for enjoying Pluto Time

• Go out a few minutes early. Let your eyes settle, then watch the light reach Pluto level as the countdown hits zero.
• Find a clear horizon. Trees and buildings to the west (evening) or east (morning) make it feel darker than it really is.
• Try reading something. NASA's favourite test: you should just about be able to read a book. That's what a Plutonian afternoon is like.
• Take a photo. NASA asked people to share Pluto Time pictures with the tag #PlutoTime, and the soft light is lovely for portraits and cityscapes.
• Mind the clouds. On a grey day, set Your sky to Light cloud or Overcast so the time matches what you'll actually see.

Frequently asked questions