You look up and the sky seems to double on itself. Two bright patches frame the Sun, as if the star were multiplying. Don’t panic: it isn’t a glitch or a video trick, but a well-identified optical phenomenon, the parhelion, also known as the “false Sun.” Its appearance is never trivial: it reveals the presence of ice crystals perched very high in the atmosphere, sometimes heralding a change in the weather. Here is how to recognize this spectacle and what it really says about the sky above you.
- The parhelion, or “false Sun,” appears when sunlight refracts through hexagonal ice crystals found in cirrus or cirrostratus clouds, with the Sun low on the horizon.
- These crystals are located in high-altitude clouds (6 to 12 km up) and do not require ground frost to be observed; the bright spots can appear colored from red to blue.
- This halo can signal the approach of a weather front, but it is only one clue among others and not a guaranteed forecast of rain within 24 hours.
- A false sun, what exactly is it?
- Ice crystals that bend light with precision
- Why this bright halo can signal a weather change
A false sun, what exactly is it?
A parhelion, nicknamed the “false Sun,” is a bright spot that appears to the left, to the right, or on both sides of the Sun at once. This optical phenomenon makes two replicas of the solar disk appear on either side of it. According to a forecaster interviewed by AFP, it is a type of atmospheric halo that occurs when sunlight is refracted by ice crystals present in the atmosphere. The observer then receives rays deflected as they pass through the crystals, arriving from a direction different from the Sun and thus producing this false body. The phenomenon is not fiction: videos showing “three suns” in the sky, like the one AFP verified in Ivory Coast, have indeed been authenticated as parhelia, not as tricks. It is by no means an isolated case: parhelia belong to a large family of halos that also includes the 22-degree halo around the Sun, the solar pillar, the parhelic circle, and the circumzenithal arc.
Ice crystals that bend light with precision
For this spectacle to appear, two precise conditions must be met: a Sun low on the horizon and hexagonally symmetric ice crystals suspended in high clouds, the cirrus or cirrostratus. Light is then deviated by a minimum angle of 22 degrees, a number to remember, even if not all configurations match it exactly. The bright patches sit at roughly the same apparent height as the Sun, and Meteo-France notes that they move away from it as the Sun climbs higher in the sky. The telltale detail for a true sky enthusiast: these patches can be very colorful, with red on the side facing the Sun, then hues that shift toward blue on the outside. Another trap to avoid: don’t expect two perfectly round disks; that is not the usual shape of the phenomenon. And contrary to a common belief, it does not require freezing temperatures on the ground to observe a parhelion. The responsible crystals are found in high clouds, where ice is present year-round, even when surface temperatures are mild. The observation conditions are simply favorable when the Sun is low and cirrus clouds drift across the sky.
Why this bright halo can signal a change in the weather
Some cirrostratus are so thin that they pass almost unnoticed: the halo, or the false Sun, becomes their sole truly visible sign in the sky. These clouds veil the sky at an impressive altitude, with bases generally between 6 and 12 kilometers. Their arrival and evolution can inform about the approach of a weather front. But beware of the common mistake: reducing the phenomenon to “a false Sun predicts rain within 24 hours” would be an unjust shortcut. It is one clue among others, not a guaranteed forecast. In terms of broader trends, Meteo-France published its bulletin for the October, November, December 2026 quarter, favoring a autumn warmer than normal over mainland France and Corsica, with low pressure near the Atlantic and a wetter-than-normal scenario, except near the Mediterranean. Periodically cooler episodes remain possible over these three months. Franceinfo even noted a clear shift toward autumn as of Wednesday, October 7, 2026, with a change in air masses and a drop of about ten degrees in Paris between Tuesday and Thursday, the afternoon falling from 25 to 15 degrees. All in all, the high clouds bearing parhelia have good reason to appear regularly in the sky amidst these variations.
A false Sun is therefore neither a bad omen nor mere chance. It is a useful reference for anyone who wants to read the sky without pulling out a barometer: its presence betrays ice crystals perched very high, often ahead of a more pronounced weather change. The next time two glints frame the Sun, look up without fear, and keep an eye on the weather bulletin in the hours that follow.
