Nandhini saw a group of stars rising at midnight on 21 June. When will she see the same group of stars rising at midnight next year?
Nandhini will see the same group of stars rising at midnight on approximately 21 June next year.
This is because the Earth completes one revolution around the Sun in about 365 days and 6 hours, returning to nearly the same position in its orbit after one year.
The same stars become visible at the same time of night on the same date each year.
Explanation
The chapter states: 'The Earth completes one revolution around the Sun in about 365 days and 6 hours.' After one complete revolution, the Earth returns to the same position relative to the Sun, and the same stars are visible at the same time of night. The chapter also explains that 'the stars seen in the night sky after sunset gradually change over a year' due to revolution, meaning the cycle repeats annually.
Solution Steps
The Earth completes one revolution around the Sun in about 365 days and 6 hours.
After one complete revolution, the Earth returns to the same position relative to the Sun.
The same stars become visible at the same time of night on the same date each year.