What do people know about the Sun

Radar bounces off the sun

Distance to the sun analysis from radar bounces

The first publication says the radar bounce took approximately 1000 seconds, the second approximately 16 minutes or 960 seconds. Taking the mean we get 980 seconds +- 20 seconds.

When bouncing radar it travels the distance twice, dividing the time in half we get 490 +- 10 seconds for the one-way time to the sun.

The speed of light is 299,792,458 m/s, Radar is part of the non-visible spectrum of light.

The distance is velocity * time.
299,792,458 * 490 = 146,898,304,420 meters
Calculating margin of error:
299,792,458 * 480 = 143,900,379,840 meters
299,792,458 * 500 = 149,896,229,000 meters

That’s between 89,415,551 miles and 93,141,199 miles.

Other measurements of the sun and other planets

With a moderatly priced telescope, people can view the details of the sun themselves: