What defines Civil Twilight?

What defines Civil Twilight?

• A. The period of total darkness after sunset
• B. The period of incomplete darkness when the center of the sun is not more than 6 degrees below the celestial horizon
• C. The time when the sun is completely below the horizon
• D. When the upper limb of the sun disappears from view

Answer: (B)

Civil twilight is defined as the period when the center of the sun is not more than 6 degrees below the celestial horizon. During this time, there is enough natural light for most outdoor activities without the need for additional lighting. It marks the transition between day and night, enabling visibility while still allowing for the sunset to occur. This definition highlights the crucial aspect of civil twilight, which is the remaining light in the sky despite the sun being positioned below the horizon. Therefore, it suggests a state of partial illumination that facilitates activities like navigation or other outdoor endeavors without the full darkness of night.

Civil twilight is defined as the period when the center of the sun is not more than 6 degrees below the celestial horizon. During this time, there is enough natural light for most outdoor activities without the need for additional lighting. It marks the transition between day and night, enabling visibility while still allowing for the sunset to occur.

This definition highlights the crucial aspect of civil twilight, which is the remaining light in the sky despite the sun being positioned below the horizon. Therefore, it suggests a state of partial illumination that facilitates activities like navigation or other outdoor endeavors without the full darkness of night.