Question

if it takes earth one year to complete one revolution, how long will it take to move from our position in the summer to our position in the winter?
(the image shows the earths revolution around the sun, with labels for winter and summer, indicating different angles of sunlight and day/night lengths.)

Explanation:

Step1: Define revolution timeline

A full revolution = 1 year = 365 days (approx)

Step2: Relate summer to winter path

Moving from summer to winter is half a full revolution (since summer and winter are opposite positions in Earth's orbit around the Sun).
<Expression>
$\text{Time} = \frac{1}{2} \times 365 = 182.5$ days
</Expression>

Answer:

182.5 days (or approximately 6 months)