What phase of a heavenly body has less than one half of its lighted portion visible?

What phase of a heavenly body has less than one half of its lighted portion visible?

• A. Full phase
• B. Quarter phase
• C. Crescent phase
• D. Gibbous phase

Answer: (C)

The phase of a heavenly body that has less than one half of its lighted portion visible is known as the crescent phase. During this phase, the illuminated part of the celestial body, such as the Moon, appears as a thin sliver or crescent shape. This occurs when the Sun's light is only partially illuminating the body, resulting in less than half being visible from a specific vantage point, such as Earth.

In contrast, the full phase represents the condition where the entire lighted side is visible, and the gibbous phase is when more than half but not all of the surface is illuminated. The quarter phase involves half of the lighted portion being visible, typically characterized by the Moon being at a right angle relative to the Earth and Sun. These distinct characteristics of lunar phases help in identifying their appearances accurately.