Across
- 2. when the earth’s axis is tilted toward the sun; the longest day and shortest night
- 8. called day arc; this is the ecliptic that the sun travels along
- 9. the process where a material takes in radiant energy from the sun converting it to heat
- 14. the period of dark when the sun is below the horizon
- 18. device that uses photovoltaic cells to collect sunlight and convert it into electricity
- 20. the power of an atom’s charged particles to cause an action or do work
- 26. the orbital motion of one celestial body around another celestial body
- 29. the half of the earth that is below the equator
- 31. the circular motion of an object around an axis or central line
- 32. autumnal equinox; when the sun is directly above the equator
- 33. division of the year based on changes in weather, ecology, and the number of daylight hours in a given region
- 34. a group of stars that forms a recognizable pattern named after its form or a mythological figure
- 35. the angle between the planet’s rotational axis and its orbital plane
- 36. the measure of hotness or coldness; measured with a thermometer
Down
- 1. the highest or greatest value
- 3. three-dimensional and perfectly round
- 4. the half of the earth that is above the equator
- 5. the radiation emitted from the sun
- 6. an imaginary line that divides the earth into northern and southern hemispheres
- 7. the strength of solar energy
- 10. vernal equinox; when the earth’s axis is perpendicular to the sun’s rays
- 11. the degree of solar energy
- 12. imaginary line that runs through the center of an object that spins
- 13. the orbital period of a planetary body
- 15. the season between winter and summer where temperatures rise
- 16. the angle between the horizon and the center of the sun; measured in degrees with the maximum being 90 degrees when the sun is directly overhead
- 17. the season between summer and winter where temperatures fall
- 19. the measurement of how far north or south of the equator a location is
- 21. the line where sea and sky meet
- 22. the two points of year when the northern and southern hemispheres have equal amounts of day and night
- 23. the coldest and darkest season of the year in temperate and polar climates; when a hemisphere is oriented away from the Sun
- 24. a repeating series of events or processes
- 25. when the earth’s axis is tilted away from the sun; the shortest day and longest night
- 27. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution
- 28. the period of light when the sun is above the horizon
- 30. the warmest and lightest season of the year in temperate and polar climates; when a hemisphere is oriented toward from the Sun