Earth observations were used very early in the program to generate flat-fields for the WFPC1 instrument.. 
Bach bẹ̀rẹ̀ ṣíṣe àwọn ìrìn àjò lọ sí Berlin ní àwọn ọdún pípé, kìí ṣe ó kéré jù nítorí ọmọ rẹ̀, Carl Philipp Emanuel, ṣiṣẹ́ bí akọrin níbẹ̀.. 