The rising of stars from night to night according to Vega is 4 minutes earlier each night.
We are aware that the earth rotates once around its axis in 24 hours and once around the sun in 365 days. The earth moves on its orbit by approximately 1° by the time it completes a rotation. Despite the fact that a star's position is fixed, it varies by 1° in relation to the sun's position.
The earth takes 24 hours to rotate 360 degrees. As a result, it will take 4 minutes to make a 1° shift. We determine the time based on the location of the sun, thus, a star appears 4 minutes earlier each night.
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