Axis- The imaginary pole through it that an object in space spins around.

Day- The time during which a space object take to complete one rotation around its axis.

Night- The time during the rotation of a space object when the sun is not visible .

Observation- An act or instance of viewing or noting a fact or occurrence for some scientific or other special purpose.

Orbit- The egg-shaped or circular path a space object takes around another object.

Revolution- The complete circular motion a space object makes around another object.

Rotation- Spinning around the axis.

Season- A division of the year marked by changes in weather, ecology, and the amount of daylight.

Tilt- The skewed angle that a space object leans while on its axis.