In a sun-centred model, you can expect the cycle of the parallax motion of the stars would occur over what tim

Question

over what time?
a)1 day
b)1 week
c)1 Month
d)1 year
e) none of the above

Answer 1

Well, the paralax comes from the fact that we are viewing the star from different angles because the earth is iun a different position at different times. The reason it is in different positions is because it is orbiting the sun. So all you need to know is how long it takes for the earth to orbit the sun and that will give your answer.

Answer 2

d) 1 year. That is because the parallax motion is caused by the Earth orbiting the Sun, which it does once a year.