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 ...

You know I like to use pictures for data from time to time, right? One problem is that I don't know much about cameras. There, I said it. Really, almost all of my photos are made with my phone. That ...

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 ...

AFTER the successful measurement of Capella as a double star by Prof. A. Michelson's interferometer method applied to the 100-in. reflector at Mount Wilson, it was known that he intended to attempt ...

The article explores the challenge of visually detecting variations in the Moon's apparent size, which are caused by its changing distance from Earth during perigee and apogee, amidst perceptual ...

THE existence of a source in the Crab Nebula with an angular diameter of less than 1 sec of arc has been revealed by observations of interplanetary scintillation at a frequency of 38 Mc/s (ref. 1).

If you were to compare planet Earth to the Sun, you'd find that you'd have to stack 109 Earths atop one another just to go from one end of the Sun to the other. Yet there are stars out there that are ...

When I watch the World Cup, I always think about set pieces. This is when the ball is placed at a certain spot and a team is allowed to then kick the ball (called a free direct kick). If this kick ...

It’s just kind of a strange coincidence. The diameter of the Sun is about 400 times larger than the Moon's, but it is also roughly 400 times farther away from Earth. These two qualities almost cancel ...