The Sun's angular diameter, as observed from Earth, is approximately 0.5°. This is based on Earth's average distance of 93 million miles (150 million km) from the Sun. From Mercury, at an average ...

This is one of my favorite stories. In short, one of John Burk's (@occam98) students wanted to launch a space balloon. If you want all the details, this post at Quantum Progress pretty much says it ...

Astronomers from Georgia State University’s Center for High Angular Resolution Astronomy (CHARA) and the Michelson Science Center at the California Institute of Technology have directly measured the ...

Elongation is the angle, in degrees, between the Sun and the planet as seen from here on the Earth. Superior planets (those that lie further from the Sun than us: Mars, Jupiter, Saturn, Uranus, ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. Intuitively, we all know that when we see an image of an object, it ...