Their colors resemble that of the rainbow; the red and yellow are towards the side of the sun, and the blue and violet on the other.

There are, however, coronae sometimes seen without parhelia, and _vice versa_.

Parhelia are double, triple, etc., and in 1629, a parhelion of five suns was seen at Rome, and another of six suns at Arles, 1666.
[297] There is a little uncertainty as to what this age was, but it was probably about twenty-five.
[298] Cicero here gives a very exact and correct account of the planetarium of Archimedes, which is so often noticed by the ancient astronomers.

It no doubt corresponded in a great measure to our modern planetarium, or orrery, invented by the earl of that name.

This elaborate machine, whose manufacture requires the most exact and critical science, is of the greatest service to those who study the revolutions of the stars, for astronomic, astrologic, or meteorologic purposes.
[299] The end of the fourteenth chapter and the first words of the fifteenth are lost; but it is plain that in the fifteenth it is Scipio who is speaking.
[300] There is evidently some error in the text here, for Ennius was born 515 A.U.C., was a personal friend of the elder Africanus, and died about 575 A.U.C., so that it is plain that we ought to read in the text 550, not 350.
[301] Two pages are lost here.