It takes one year or 365 days or approximately 365 and ¼ days for the Earth to complete its’ orbit around the sun, which is why we have a leap year every four years and February has one extra day. It is a circular orbit, and there is only a small variance between the neighboring and outermost points from the sun throughout the realm. The Earth travels around the sun, and at the same time, it rotates on its axis and is tilted.
The earth’ axis remains tilted in the same direction throughout the year. This means that on the pole will be directed away from the sun at one side of the orbit, and during the other half of the realm, it will be tilted toward the sun. Therefore, we have the seasons, so when the north pole is tilted towards the sun, the northern hemisphere has summer, and when it is away from the sun, we have winter.