Which triangle is formed by the angles polar, zenith, and star?

The triangle formed by the angles polar, zenith, and star is known as the PZS triangle. This triangle specifically involves the relationships between these angles in the context of celestial navigation and astronomy.

In celestial navigation, the polar angle refers to the angle measured from the zenith down to the celestial equator, the zenith angle indicates the angle from the vertical down to an object in the sky, and the star angle is the angle that connects these measurements related to a specific star. The PZS triangle represents the geometrical relationships and can be crucial for understanding observations of celestial bodies.

The concept of this triangle is fundamental in celestial mechanics and astronomical studies, where accurate measurements of angles are necessary for navigation and understanding the position of celestial bodies in the sky. Thus, selecting the PZS triangle reflects an understanding of these critical relationships in navigating and interpreting the night sky.

The other options do not accurately capture the specific angles associated with the polar, zenith, and star angles within this context, hence why they are not the correct choice.