The date of your next solar return and the ascendant of your next 12 months. Free and instant.
Your civil birthday falls on the same date every year. Your solar return, however, happens at a moment that shifts by several hours from one year to the next, sometimes by a full day: the exact instant the Sun comes back to its birth longitude. Only a precise calculation can find it.
The tool determines that exact date and time on the JPL (NASA) precision ephemerides, then casts the sky of that instant from your birth place and extracts the Ascendant: the sign rising on the horizon at that precise moment, which sets the tone of your next twelve months.
One honest limitation: this free calculation uses your birth place, whereas strictly speaking the solar return should be cast where you are on your birthday. Your full Solar Return relocates the chart, which can change the year's Ascendant, and reads your year month by month.
La révolution solaire, c'est le ciel de ton anniversaire : la carte dressée à l'instant exact où le Soleil revient à sa position de naissance. Elle colore les 12 mois à venir, et son ascendant donne le ton de ton année.