astronomy

It''s consensus that the very similar apparent sizes of the Moon and the Sun as seen from Earth is a coincidence (as already answered in this site). This provides us with

2024 May 24

Why do we say that the Earth moves around the Sun?

3 The sun, moon, earth (and so on) all move around each other. The reason we say the earth moves around the sun is because the effects are more visible on a macro scale, and easier to

2025 Jan 18

Why does the Sun "shine brighter" some days? [duplicate]

1) The sun seems brighter (more dazzling) if there is more scattering in the atmosphere. The sun would actually look very small to us in the sky if there were no atmosphere (it''s the same

2024 Sep 28

Why does the Sun always rise in the East?

The Sun does not rise, it is the horizon that goes down. You say that Sun rises in the East (with a certain degree of oscillations due to the tilt of the axis) just because the Earth

2024 Dec 14

rotation

The sun does rotate. We can see the rotation of the sun by the doppler shift of the light we get from the sun. . (Image from this page.) Since we know the characteristic spectrum of light from

2025 Jun 15

How come the Sun''s gravity can hold distant planets in orbit, but

First, we should speak of acceleration rather than force, because like I said earlier all objects at a given distance from the Sun experience different forces but the same

2024 Sep 04

Nuclear fission in the Sun

The Sun''s energy comes primarily from fusion of light elements in its core. It is estimated that a very small fraction of mass of the Sun (~$10^{-12}$ times the abundance of hydrogen) is

2026 Feb 20

What is the simplest way to prove that Earth orbits the Sun?

Assume you''re talking to someone ignorant of the basic facts of astronomy. How would you prove to them that Earth orbits the Sun? Similarly, how would you prove to them

2025 Jan 11

How much lux does the Sun emit?

I want to know how much lux the sun emits on a bright day - I don''t mean when one stares directly at the sun, but rather when one walks casually outside when the sun is shinning brightly. Now the

2025 Sep 14

How long until the sun cannot sustain human life on earth?

The sun will last, at its current brightness for 9 billion more years. How long until the sun gets burned down to the point where it cannot sustain life on Earth anymore? Updated: I am more

2024 Apr 29

View/Download Sun shed price and solar panel price [PDF]

PDF version includes complete article with source references. Suitable for printing and offline reading.