What is World Astronomy Day ?

World. International Astronomy Day is celebrated twice a year, close to the first quarter moon of spring and fall — on May 15 and October 9, this year. 

Why do we celebrate Astronomy Day ? 

What are the 4 types of astronomy ?

The four sub-fields of Astronomy are: Astrophysics; Astrometry; Astrogeology; and Astrobiology 

Which day is celebrated twice a year ? 

International Astronomy Day is celebrated twice a year, during autumn and spring.