Questions and Answers
What is the definition of 'diurnal motion'?
The apparent daily motion of the sky from East to West
Which phenomenon is caused by the Earth's revolution around the sun?
Annual motion
What is 'precession'?
A cyclic wobbling in the Earth’s axis of rotation with a period of 25,772 years
What is 'retrograde motion'?
Signup and view all the answers
What is the celestial equator?
Signup and view all the answers
When do equinoxes occur?
Signup and view all the answers
What is the celestial motion described as in the text?
Signup and view all the answers
Which model is associated with the assumption that the Sun lies at or near a central point while the Earth and other bodies revolve around it?
Signup and view all the answers
Who proposed the debunked theory that the Earth is the center of the universe, with the sun and planets revolving around it?
Signup and view all the answers
Who proposed a model positioning the Sun at the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds?
Signup and view all the answers
What does the term 'vertical motion' refer to in the context of celestial motion?
Signup and view all the answers
Who managed to place the Sun in the middle of the solar system and also placed the planets in the right order from the Sun?
Signup and view all the answers
What kind of motion is also called alternate motion and refers to the motion of chemical change like burning and decay?
Signup and view all the answers
What is terrestrial motion according to the text?
Signup and view all the answers
What is the cosmological model where the Earth is assumed to be at or near a central point while the Sun and other bodies revolve around it?
Signup and view all the answers
Who is known for creating a model that had a series of 53 concentric, crystalline, transparent spheres rotating on different axes?
Signup and view all the answers
