impersonal micrometer

Instrument to measure a star transit in a telescope with a moving thread

en-GB/ˌɪmˈpɜːsənl maɪˈkɹɒmɪtə/
en-US/ɪmˈpɝsənəl maɪˈkɹɑmətɚ/

Κατηγορίες:

astronomical instrument