How Stars Rise and Set: Exploring the Wonders of Earth's Rotation

How do stars like Rigel rise and set each day?

Assuming a constant rate of Earth's rotation and neglecting any axial tilt effects, Rigel, a star, would rise approximately 4 minutes earlier each day. Therefore, if Rigel rises at 6 PM today, what time will it rise tomorrow and a month from now?

Answer:

If Rigel rises at 6 PM today, it would rise at around 5:56 PM tomorrow. In one month, comprising roughly 30 days, Rigel would rise approximately 2 hours earlier, at around 4 PM.

As we gaze up at the night sky, we witness the enchanting dance of stars like Rigel. These celestial bodies seem to move across the sky, rising and setting each day. But have you ever wondered how this mesmerizing phenomenon occurs?

The Earth rotates approximately once every 24 hours, causing the stars to appear to rise and set each day. This rotation rate is relatively constant over short timescales. Therefore, if a star rises at a specific time on a given day, it will rise approximately 4 minutes earlier the following day, as 24 hours divided by 60 minutes gives an average of 4 minutes per minute of Earth rotation.

Multiplying this by the number of days in a month (30) results in approximately 2 hours earlier for the star's rise time. This gradual shift in the timing of star rises adds to the dynamic beauty of the night sky, inviting us to marvel at the wonders of Earth's rotation.