Which among the following days is celebrated twice a year?
A.
World Freedom Day
B.
International Human Space Flight Day
C.
International Astronomy Day
D.
Zero Discrimination Day
Answer: Option C
Explanation:
The International Astronomy Day is celebrated twice a year, once on May 2 and the second time on September 26. The day aims to spread awareness about the world of astronomy. The first-ever International Astronomy Day was celebrated in 1973.