Sun is a ten-word grid consisting of three nouns, three verbs, four adverbs, doubled by two syntactic orders. This yields precisely seventy-two sentences, or poems, if you will, one for each eclipse in Saros 126 (1179–2459). The generator is a Prolog program; the total eclipse of 12 August 2026 is member forty-eight of that series. -- Every sonic element in this piece is dictated by a mathematical constraint. The Drone: A2 is scientifically standard at exactly 110 Hz. This acts as the acoustic equivalent of the Saros cycle of solar eclipses. Each letter in the phrase "apertures align rhythmically" selects an overtone (partial) of that 110 Hz fundamental based on its alphabetical position modulo 12 (where A=1, B=2... L=12, M=1, etc.). The Weighting: The intensity of each overtone is driven purely by the recurrence of that letter within the sentence. An audit of the phrase validates the exact harmonic weights of the piece: Primary Weight (3 occurrences): a, l, r Secondary Weight (2 occurrences): e, h, i, t, y Tertiary Weight (1 occurrence): c, g, m, n, p, s, u Because of the modulo 12 acoustic law, the letters A (1), M (13), and Y (25) all map perfectly back to the 1st partial. As a result, the word "rhythmically" alone strikes the fundamental frequency four distinct times, while the initial "a" in apertures ensures the sounding line begins by reinforcing its own foundation. -- Sun: Triptychs for Solar Eclipses, 2026 Single-channel video with sound · 10 seconds, looping · 1000 × 916 px · mono. -- Ten seconds, thirty frames per second, three hundred frames, one still image. One second up from black, eight held, one back down; the audio follows the same envelope. H.264 / AAC-LC, 44.1 kHz mono, peaking at −1.4 dBFS. Fundamental measured at 110.000 Hz. Aperture is one of three video panels — with Augury and Apparition — which sound the three rows of the grid as printed. Poem generator: Prolog, MIT licence, github.com/bergholt/triptych. Full essay at bergholt.net/sun.