These _Phaenomena_ are thought worthy to be inserted here, for the Speculation of the Curious in those Kingdoms; as they were publisht in the French _Journal des Scavans_, of May 10, 1666. _viz._ The 9th of _April_ of this present year, about half an hour past nine, there appear'd three Circles in the Sky. _One_ of them was very great, a little interrupted, and white every where, without {220} the mixture of any other colour. It passed through the midst of the Sun's _Disk_, and was parallel to the _Horizon_. Its _Diameter_ was above a hundred degrees, and its _Center_ not far from the _Zenith_. The _Second_ was much less and defective in some places, having the Colours of a Rainbow, especially in that part, which was within the great Circle. It had the true Sun for its Center. The _Third_ was less, than the first, but greater than the second; it was not entire, but only an Arch or Portion of a Circle, whose Center was far distant from that of the Sun, and whose circumference did, by its middle, join to that of the least Circle, intersecting the greatest Circle by its two extreams. In this Circle were discerned also the Colours of a Rainbow, but they were not so strong, as those of the _Second_. At the place, where the circumference of this _Third_ Circle did close with that of the _Second_, there was a great brightness of Rainbow-Colours, mixt together: And at the two extremities, where this _Second_ Circle intersected the _First_, appear'd two _Parhelia's_ or Mock-suns; which shone very bright, but not so bright, nor were so well defined, as the true Sun. The False Sun, that was towards the _South_, was bigger, and far more luminous, than that towards the _East_. Besides those two _Parhelia's_, which were on the two sides of the true Sun, in the intersection of the _First_ and _Third_ Circle, there was also upon the _First_ great Circle, a _third_ Mock-sun, situated to the _North_, which was less and less bright, than the two others. So that at the same time there were seen _Four_ Suns in the Heavens. [Illustration] [Illustration] _Figure_ II. will illustrate the Position of this _Phaenomenon_. A. _The Zenith or the Point Vertical to the place of Observation._ B. _The true Sun._ S C H N. _The great Circle, altogether White, almost parallel to the Horizon, which pass'd through the true Sun's Diske, and upon which were the false Suns._ D E B O. _A Rain-bow about the Sun, forming an entire Circle, but interrupted in some places._ H D N. _A portion of a Circle, that was Excentrick to the Sun, and greater than the Circle_ D E B O, _which touch'd_ D E B O, _and was confounded with it in the point_ D. {221} H N. _The two Mock-Suns, in the intersection of the Semicircle_ H D N, _and the Circle_ S C H N: _The midst of which two False-Suns was white and very luminous; and their Extremities towards_ D I _were tinged with the Colours of a Rainbow. The False Sun, mark'd_ N, _ was fainter than that, which is mark'd_ H.