In Evidence
Ephemeris Calculator
Compute Neptune ephemerides for any date and time between 01 Jan 1600 and 31 Dec 2499 and display the predicted position in an interactive sky map.
How Far is Neptune from Earth?
The distance of Neptune from Earth is currently 4,501,440,659 kilometers, equivalent to 30.090272 Astronomical Units. Light takes 4 hours, 10 minutes and 15.1898 seconds to travel from Neptune and arrive to us.
The following chart shows the distance of Neptune from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.
The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of Neptune from Earth is also available as a real time updated value in the Live Position and Data Tracker.
Closest approach of Neptune to Earth
Between January 1600 and December 2499 the closest approach of Neptune to Earth happens on Thu Nov 8 2373 at a distance of 28.80636581 Astronomical Units, or 4,309,370,997 kilometers:
NOTE: values for the closest approach are computed with a sampling interval of 1 day.