Across
- 5. An equator is an imaginary line around the middle of a planet or other celestial body.
- 6. The time the earth takes to make one revolution around the sun.
- 8. The optimal stimulus for setting your circadian clock for daytime wakefulness, nighttime sleep, mood & health.
- 10. The degree of hotness or coldness of an object.
- 12. The curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
- 15. A period of twenty-four hours as a unit of time, reckoned from one midnight to the next, corresponding to a rotation of the earth on its axis.
- 16. The period of darkness in each twenty-four hours; the time from sunset to sunrise.
- 17. The angular distance of a place north or south of the earth's equator, or of a celestial object north or south of the celestial equator, usually expressed in degrees and minutes.
- 18. Each of the twelve named periods into which a year is divided.
- 19. In a direction opposite to that in which the hands of a clock rotate as viewed from in front.
- 20. The action of rotating around an axis or center.
Down
- 1. The axis of rotation of the Earth is tilted at an angle of 23.5 degrees away from vertical, perpendicular to the plane of our planet's orbit around the sun.
- 2. Sunlight More concentrated heat, which tends to be warmer but also covers a smaller surface area.
- 3. A view or opinion that is incorrect because based on faulty thinking or understanding.
- 4. The star around which the earth orbits.
- 7. The planet on which we live; the world.
- 9. The star of the Northern Hemisphere toward which the axis of the Earth points.
- 11. An imaginary line about which a body rotates.
- 13. At high angles ( 65o-90o) the sun's radiation is most intense.
- 14. The angular distance of a place east or west of the meridian at Greenwich, England, or west of the standard meridian of a celestial object, usually expressed in degrees and minutes.