10 months ago
Last edited at 12:54AM on 2/1/2013
The position of the sun is fixed in space. The tilt of the earth is fixed. As we move around the sun over a year, the APPARENT position of the sun moves gradually between the Tropic of Cancer (north of the equator) and the Tropic of Capricorn (in the southern hemisphere). This what marks the changing of the seasons.
No. the earth is moving around the sun, and the earth is tilted on it axis. Therefore it appears to move north but really the earths northern hemisphere is moving more in line with the sun. ( but yes to us it seems that way.) it's all relative !!!
While the tilt of the earth stays at about 23.5 degrees, it wobbles about in it's orbit kind of like a toy top can wobble. This wobble corresponds very closely to a year and it's this wobble that makes the sun's apparent position change as we go through the yearly cycle. That's what causes our seasons and length of days to change.