| A | B |
|---|
| axis | an imaginary line around which a sphere, like a planet, rotates |
| compass | an instrument for determining directions, as by means of a freely rotating magnetized needle that indicates magnetic north |
| day | the time between sunrise and sunset on Earth |
| night | the time between sunset and sunrise on Earth |
| North Pole | one of the ends of an imaginary axle, called an axis, on which Earth rotates. The North Pole always points towards the North Star |
| North Star | the star positioned directly over Earth’s North Pole; also known as Polaris |
| orbit | to move or travel around an object in a curved path |
| orientation | the direction something points |
| revolution | to travel around something else in a circular path; orbit |
| rotation | turning around on an axis |
| shadow | the dark area behind an object that blocks light |
| sun | the star at the center of the solar system around which everything else orbits |
| sunrise | the point between night (darkness) and day (daylight). The time at which day first happens. |
| sunset | the point between day (daylight) and night (darkness). The time at which night first happens |
| opaque | matter through which light cannot travel |
| transparent | matter through which light can travel |
| translucent | matter through which some light can travel |
