For 100 years (beginning from the middle of the 19th century), eclipse observations have been the only
source of information about the solar corona. The situation cardinally changed as space astronomy developed. Nevertheless, the last observations indicate that the possibilities of using eclipse observations in order to study the solar corona are still far from being exhausted. For example, some aspects of the continuous emission of the inner corona cannot be studied during noneclipse observations even from vehicles. The processes of solid material sublimation in near circumsolar space can be extensively studied. Other problems also exist.