How Far Is the Sun From Earth, in Light-Minutes?

Quick answer: Sunlight takes about 8 minutes 20 seconds (roughly 499 seconds) to reach Earth on average — meaning you're always seeing the Sun as it looked about 8 minutes ago. The exact figure ranges from about 8 min 15s near perihelion in January to about 8 min 27s near aphelion in July. See today's exact figure.

The average Earth–Sun distance — 149,597,871 kilometres — is defined as one astronomical unit (AU), the standard yardstick for measuring distances within the solar system. Dividing that by the speed of light, 299,792 kilometres per second, gives almost exactly 499 seconds, or 8 minutes and 19 seconds. This is why the figure "8 minutes 20 seconds" gets rounded and repeated so often — it's very close to the true average.

Earth's orbit is a slight ellipse (eccentricity about 0.017), not a perfect circle, so Earth's actual distance from the Sun varies across the year. At perihelion, in early January, Earth is about 147.1 million kilometres from the Sun — light-time roughly 8 minutes 15 seconds. At aphelion, in early July, Earth is about 152.1 million kilometres out — light-time closer to 8 minutes 27 seconds. The swing across the year is only about 12 seconds, small compared to the total, but real.

Because light takes about 8 minutes to travel from the Sun to Earth, every glimpse of sunlight you see is necessarily 8 minutes old — you are never observing the Sun as it exists at this exact instant, only as it looked roughly 8 minutes ago. If the Sun's light output were to suddenly and dramatically change, nobody on Earth would know for about 8 minutes. This delay is small on human timescales but is the same basic principle, scaled down, behind the much larger light-time delays spacecraft experience when communicating across the solar system.

From the Sun to…	Approx. one-way light-time
Mercury	~3.2 minutes
Earth	~8.3 minutes
Mars	~12.6 minutes
Jupiter	~43.2 minutes
Neptune	~4.1 hours