photometric quantity

measure used in astronomy

en-GB/ˌfəʊtəʊˈmɛtɹɪk ˈkwɒntɪtɪ/
en-US/ˌfoʊtoʊˈmɛtɹik ˈkwɑntɪti/

دسته بندی ها:

photometric quantity