| No. | Term | Definition |
|---|---|---|
| 1. | Ablaze | Burning brightly; glowing intensely. |
| 2. | Afterglow | Light lingering after sunset. |
| 3. | Albedo | Reflectivity of a surface. |
| 4. | Apex | Highest point; peak. |
| 5. | Aphelion | Farthest Earth from the Sun. |
| 6. | Aurora | Polar lights from solar particles. |
| 7. | Azimuth | Sun’s compass direction angle. |
| 8. | Beacon | Guiding light source. |
| 9. | Beam | Narrow ray of light. |
| 10. | Blackbody | Ideal radiator; Sun approximates it. |
| 11. | Blaze | Strong, bright flame or light. |
| 12. | Blue sky | Daylight-scattered sunlight appearance. |
| 13. | Brightness | Perceived intensity of light. |
| 14. | Brilliance | Dazzling brightness. |
| 15. | Burn | To produce heat and light. |
| 16. | Calor | Heat; warmth. |
| 17. | Chromosphere | Sun’s reddish middle atmosphere. |
| 18. | Circadian | Daily rhythm influenced by sunlight. |
| 19. | Clear day | Sky conditions with strong sunlight. |
| 20. | Climate | Long-term weather patterns driven by Sun. |
| 21. | Corona | Sun’s outer atmosphere. |
| 22. | Coronal mass ejection | Huge solar plasma eruption. |
| 23. | Cosmic rays | High-energy particles; Sun modulates them. |
| 24. | Dawn | First light before sunrise. |
| 25. | Daybreak | Beginning of daylight. |
| 26. | Daylight | Natural light from the Sun. |
| 27. | Dazzle | Overwhelm with bright light. |
| 28. | Diffuse light | Soft light scattered by clouds. |
| 29. | Dusk | Fading light after sunset. |
| 30. | Eclipse | Sun blocked by Moon. |
| 31. | Ecliptic | Sun’s apparent yearly path. |
| 32. | Energy | Capacity to do work; solar output. |
| 33. | Equinox | Day and night nearly equal. |
| 34. | Eruption | Sudden solar outburst. |
| 35. | EUV | Extreme ultraviolet solar radiation. |
| 36. | Exposure | Amount of light received. |
| 37. | Facet | Small bright region on Sun. |
| 38. | Filament | Dark, threadlike solar feature. |
| 39. | Fire | Combustion producing heat and light. |
| 40. | Fireball | Very bright meteor; sunlike glare. |
| 41. | Flare | Sudden burst of solar radiation. |
| 42. | Fluence | Radiation dose over time. |
| 43. | Flux | Flow rate of energy or particles. |
| 44. | Glare | Harsh, blinding brightness. |
| 45. | Gleam | Brief or soft shine. |
| 46. | Glow | Steady, gentle light. |
| 47. | Golden hour | Warm light near sunrise or sunset. |
| 48. | Granulation | Mottled pattern on solar surface. |
| 49. | Greenhouse effect | Atmospheric warming from trapped heat. |
| 50. | Halo | Ring around Sun from ice crystals. |
| 51. | Heat | Thermal energy from sunlight. |
| 52. | Heliocentric | Centered on the Sun. |
| 53. | Heliopause | Boundary of Sun’s solar wind. |
| 54. | Heliosphere | Region dominated by solar wind. |
| 55. | High noon | Time when Sun is highest. |
| 56. | Horizon | Line where sky meets Earth. |
| 57. | Hydrogen | Primary element in the Sun. |
| 58. | Illumination | Lighting provided by a source. |
| 59. | Insolation | Incoming solar radiation. |
| 60. | Irradiance | Power of light per area. |
| 61. | Jet stream | High-altitude winds influenced by heating. |
| 62. | Kelvin | Temperature unit used in solar physics. |
| 63. | Kinetic energy | Energy of motion; solar wind particles. |
| 64. | Latitude | Affects Sun angle and daylight length. |
| 65. | Light | Visible radiation from the Sun. |
| 66. | Lightyear | Distance light travels in a year. |
| 67. | Limb | Edge of the Sun’s disk. |
| 68. | Luminosity | Total light power emitted. |
| 69. | Magnetic field | Solar magnetism shaping activity. |
| 70. | Magnetosphere | Region shielded by planetary magnetism. |
| 71. | Meridian | Line Sun crosses at solar noon. |
| 72. | Midday | Middle of the day; brightest time. |
| 73. | Midsummer | Season with longest daylight. |
| 74. | Morning | Time after sunrise. |
| 75. | NOAA space weather | Solar activity monitoring and forecasts. |
| 76. | Nuclear fusion | Process powering the Sun. |
| 77. | Occultation | One body hides another. |
| 78. | Orbit | Path around the Sun. |
| 79. | Ozone | UV-absorbing atmospheric gas. |
| 80. | Parhelion | Sun dog; bright side spot. |
| 81. | Penumbra | Partial shadow around umbra. |
| 82. | Photon | Particle of light. |
| 83. | Photosphere | Visible surface of the Sun. |
| 84. | Plasma | Ionized gas composing the Sun. |
| 85. | Polar day | Continuous daylight near poles. |
| 86. | Radiance | Light emitted per solid angle. |
| 87. | Radiation | Energy emitted as waves or particles. |
| 88. | Ray | Straight line of light. |
| 89. | Reflection | Light bouncing off surfaces. |
| 90. | Refraction | Light bending through air or glass. |
| 91. | Scorch | To burn the surface with heat. |
| 92. | Shade | Area protected from direct sun. |
| 93. | Shadow | Dark area blocking sunlight. |
| 94. | Shine | Emit or reflect bright light. |
| 95. | Sky | Apparent dome lit by sunlight. |
| 96. | Solar | Relating to the Sun. |
| 97. | Solar constant | Average solar energy at Earth. |
| 98. | Solar noon | Sun’s highest daily position. |
| 99. | Solar panel | Device converting sunlight to electricity. |
| 100. | Solar wind | Stream of charged particles from Sun. |