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Why does the sun appear to rise and set though it is actually not moving?


Shivangi asks


English: Animated image of Earth rotating.

First of all I would like to remind you that it is incorrect to say that “sun is not moving”. Sun is also moving. But the question here is, “Sun appears to rise and set not because of its motion”.

Sunset and sunrise are caused by the rotation of earth. When earth rotates, the position of sun appears to change and it seems as if the sun is revolving around the earth; just like we feel that the ground is revolving around us when we are looking out from a rotating merry-go-round.

Parallax Method

Can you please explain about paralax method?

How to use it to calculate the distance between two astronomical objects?

Asked Shivangi


Parallax  is the change in the apparent position of an object due to change iv view point.

Read more here

The parallax method is a way of measuring distances of far-away objects.

Read more: http://wiki.answers.com/Q/What_is_the_parallax_method#ixzz21XoSSONi

Parallax Method to determine the distance of stars




Astronomers use the principle of parallax to measure distances to celestial objects including to the Moon, the Sun, and to stars beyond the Solar System.

See the animation below to understand the parallax method for determining the stellar distances

Find more information here



Aswin Ramesh Asked (via email)
is it the same method that we use in trigonometry ?
Parallax is a different concept, though we are using the principle of trigonometry to solve problems based on it.

Doubt in Law of Gravitation

Newton's law of universal gravitation for two ...
Colorized engraving after Enoch Seeman's 1726 ...

According to law of gravitation

Asked Ankit Sharma






A question from Gravitation.

Prince Patel Asked:




Spaceship and gravity – a problem


Why Earth does not collide with the sun?

If our earth rotates around sun in discrete orbits, then why it doesn’t collide with Sun because of gravitational force acting between both bodies ?


Earth is moving around the sun in such a way that the distance to be traveled TOWARDS sun is compensated by its circular motion. Therefore, instead of “falling towards” the sun, earth “falls around” and never reaches the sun.

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