Abstract
This paper deals with the brightness changes of come P/Halley in the past. On the basis of the analysis of Sun-Earth-comet configuration at the time of perihelion passage within 30 apparitions of the comet since 240 BC, several groups of apparitions of similar observing geometry were specified. These groups were analysed with emphasis on brightness variations of the comet on different, long time scales. Absolute magnitudes and duration of naked-eye visibility both in pre-perihelion and post-perihelion periods of the comet are the main criteria for the aim of this study. Some brightness increase of the comet in 912–1222 is indicated.
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