How accurate are these distances?

The distances are approximate. The tool uses simplified Keplerian orbital elements from the Meeus "Astronomical Algorithms" approach, which provides accuracy within a few percent for the visible planets. For precision astrometry, a full VSOP87 or JPL Horizons ephemeris is needed.

Why does the distance to Venus or Mars change so much?

Inner planets like Venus and Mars have orbits closer to Earth's, so when they are on the same side of the Sun the distance is small, but when they are on the opposite side the distance can be nearly double the diameter of their orbit. Outer planets change less dramatically in relative terms.

What is an astronomical unit (AU)?

One astronomical unit is the average distance from Earth to the Sun, approximately 149.6 million kilometers (93 million miles). It is the standard unit for measuring distances within the solar system.

Why is Pluto not included?

Pluto was reclassified as a dwarf planet in 2006. Its highly elliptical and inclined orbit also makes simplified Keplerian calculations less reliable compared to the eight major planets.

How often do the values update?

The displayed distances update automatically every 60 seconds using your device clock. You can also click the Refresh button for an immediate recalculation.

Does this tool contact any server?

No. All calculations happen entirely in your browser using JavaScript. No data is sent to or received from any server after the page loads.

Planet Distance Now

Name: Planet Distance Now
Availability: InStock
Author: Nham Vu

See the real-time approximate distance from Earth to every planet in the solar system, updated live in your browser using simplified orbital mechanics.

Calculating...

Distances are approximations calculated from simplified Keplerian orbital elements (Meeus method). Accuracy is within a few percent for all major planets. Values refresh every 60 seconds. For precision ephemerides, consult NASA JPL Horizons.

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Summary

See the real-time approximate distance from Earth to every planet in the solar system, updated live in your browser using simplified orbital mechanics.

How it works

Your browser reads the current date and time.
Each planet's heliocentric position is estimated from its mean orbital elements (semi-major axis, eccentricity, inclination, and mean anomaly at J2000) using the Meeus simplified algorithm.
Earth's position is computed the same way.
The straight-line distance between Earth and each planet is calculated from 3-D heliocentric coordinates.
Results are displayed in AU and millions of kilometers and refresh automatically every 60 seconds.

Use cases

Satisfy curiosity about how far Mars or Jupiter is from Earth right now.
Support classroom discussions about the dynamic nature of planetary distances.
Help amateur astronomers know which planets are currently closest and easiest to observe.
Understand why communication delays to Mars missions vary so dramatically.
Illustrate how the solar system is in constant motion.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu