Why does the sun rise in the east and set in the west?

Earth’s Rotation and Its Effects

The Earth’s rotation is the primary reason for the sun’s apparent movement across the sky. The planet takes approximately 24 hours to complete one full rotation on its axis. This rotation creates day and night cycles, with the sun appearing to rise in the east and set in the west.

Understanding Azimuth and Altitude

Navigators use azimuth and altitude to determine their position and course. Azimuth is the compass bearing of a celestial body, such as the sun or a star, while altitude is the angle between the horizon and the celestial body. To calculate azimuth and altitude, you can use a sextant or a compass. For example, if the sun is at an altitude of 30 degrees and you know the local latitude, you can use this information to determine your position.

Applying Celestial Navigation

To determine the direction of the sun, you can use the following technique: when the sun is directly overhead, its azimuth is 180 degrees from the north. As the sun moves east, its azimuth decreases, and as it moves west, its azimuth increases. This knowledge allows you to use the sun as a navigation aid, even in cloudy or overcast conditions.