| A | B |
|---|
| Asteroids | objects revolving around the sun that are too small and too numerous to be considered planets. |
| Axis of rotation | an imaginary line that passes through Earth's center and the North and South poles, about which earth rotates. |
| Celestial observations | looking at aspects of astronomy such as planets and stars with the sense of sight. |
| Comets | a ball of ice and dust whose orbit is long, narrow ellipse(revolves around the sun). |
| Cyclic pattern | something that happens over and over, predictable. |
| Day | 24 cycle of daylight and darkness |
| Earth's orbit | earth's path as it travels around the sun |
| Earth's rotation | earth spinning on its axis is called rotation. Earth rotates once every 24 hours. |
| Eclipse | the partial or total blocking of one object by another. |
| Gravity | the attractive force between two objects. |
| Latitude | the distance north or south from the equator , measured in degrees. |
| Longitude | the distance in degrees east or west of the prime meridian. |
| Luminous | Emitting light, especially emitting self-generated light. |
| Meteor shower | chunks of rock and dust in space that enter the earth's atmosphere. |
| Moons | any natural satellite of a planet. |
| Phases of the moon | different shapes of the moon as seen from earth. A whole phase takes 1 month to happen. |
| Planets | a nonluminous celestial body larger than an asteroid or comet, illuminated by light from a star, such as the sun, around which it revolves. |
| Regular/predictable motion | the cyclic, repeating movement of a celestial object such as the movement of earth around the sun. |
| Revolution | the movement of an object around another object. |
| Seasons | one of the four natural divisions of the year, spring, summer, fall, and winter, in the North and South hemispheres. |
| Solar system | the sun together with the 9 planets and all other celestialbodies that orbit the sun. |
| Spherical | having the shape of a sphere; globular. |
| Star | any of the celestial bodies visible at night from earth as relatively stationary, usually twinkling points of light. |
| Sun | a star that is the basis of the solar system that sustains life on Earth, being the source of heat and light. |
| Tide | the daily rise and fall of Earth's waters on shores caused by gravatational attraction of the moon and sun. |
| Time | a number, as of years, days, or minutes. Can represent a duration. |
| Year | the period of time during which Earth completes a single revolution around the sun, consisting of 365 days. |
