IPA: /nɒnˌæstrəˈnɒmɪkəl/
KK: /nɑnəstrəˈnɑmɪkəl/
Not related to astronomy or celestial bodies.
The costs of the project were nonastronomical, making it feasible for the community.
Nonastronomical → It is formed from "non-" (meaning not) and "astronomical" (from Greek "astron" meaning star and "nomos" meaning law). The word "nonastronomical" means not related to or not based on the laws or principles of astronomy.
Think of 'non-' meaning not, and 'astronomical' relating to stars and their laws. This helps you remember that 'nonastronomical' refers to something that is not related to the study of stars.