She was an astronomer at the Harvard Observatory. - Она работала
астрономом в Гарвардской обсерватории.
Was she an astronomer at the Harvard Observatory (общий)
What was she at the Harvard Observatory (специальный)
She was an astronomer at the Harvard Observatory, wasn`t she(разделительный)
Was she an astronomer at the Harvard Observatory or at the Goldstone Observatory (альтернативный)
Who was an astronomer at the Harvard Observatory (специальный вопрос к подлежащему с вопросительным словом who)