Hevelius made numerous researches on comets, and suggested that the form of their paths might be a parabola.
In the time of Hevelius, Mira was once invisible for four years.
Hevelius had his book printed in his own house, at lavish expense, and himself not only designed but engraved many of the plates.
It was named Lacerta by Hevelius in 1690, and this name it still retains.
His lunar observations revealed 600 spots on the moon, which is fifty more than had been found by Hevelius.
The comet of 1652, so carefully observed by Hevelius, almost equaled the moon in apparent magnitude.
Hevelius states that he himself witnessed a similar appearance in the head of the comet of 1661.
Ptolemy catalogued fourteen stars, Tycho Brahe twenty-seven, and Hevelius forty in this constellation.
This work, after having passed through several hands, became the property of Hevelius, who was capable of appreciating its merits.
The halo of 46 degrees and the rare halo of 90 degrees, or halo of Hevelius, also surround the luminary.