EVIDENCE FILE · ev-1883-bonilla
Bonilla's Procession — Zacatecas, 1883
Hundreds of dark objects crossed the Sun above one observatory
In the research record
In August 1883, astronomer José Árbol y Bonilla was observing the Sun from Zacatecas Observatory in Mexico. Looking at the Sun through a telescope turns anything passing between the telescope and the solar surface into a dark silhouette.
Across August 12 and 13, Bonilla reported 447 separate objects crossing the Sun. He photographed some of them and recorded their passage. The original glass plates are no longer available, but reproduced images and his written account were published in the French astronomy journal L'Astronomie in 1886.
The photographs show that dark forms crossed the telescope's view of the solar disc. They do not reveal the objects' distance. A small object nearby and a much larger object far away can cover the same apparent area in a telescope.
Bonilla proposed bodies travelling inside Mercury's orbit or groups of meteoroids. An editorial published with his report suggested birds or insects passing closer to the telescope, an explanation Bonilla rejected.
In 2011, Héctor Javier Durand Manterola and colleagues re-examined the published record. Because the event was reported from Zacatecas but not from observatories farther away, they proposed that Bonilla had seen fragments of a comet passing very close to Earth. Their model uses the limited geographic visibility to estimate distance and size.
That modern interpretation is an arXiv preprint, not a peer-reviewed confirmation, and it cannot be checked against the lost original plates. The historical observation is real. The distance, size, and nature of what crossed the Sun remain unresolved.
What this adds
The 140-year record begins not with a modern sensor or a government file, but with photographs and a published observing log from 1883. Even the natural explanation proposed later would describe an extraordinary event close to Earth.
Status: published historical observation; modern explanation at preprint level. Bonilla's report and reproduced photographs survive, while the original plates, object identity, distance, and fragmented-comet interpretation remain unresolved.
In the novel
In Chapter 15, Bonilla marks the moment the archive acquires photographs. José Árbol y Bonilla records hundreds of dark objects crossing the Sun in 1883, then publishes the images and observing log three years later. The novel gives the modern fragmented-comet interpretation its full status: a preprint built from surviving reproductions, neither confirmed nor refuted. The physical record enters the lens alongside a proposed natural explanation that is itself an extraordinary near-Earth event.
| Source | Status | Role |
|---|---|---|
| Bonilla, José A. y. “Passage sur le disque solaire d’un essaim de corpuscules, vu à l’observatoire de Zacatecas (Mexique).” L’Astronomie (1 January 1886): 347–350. | Historical record | historical record |
| Durand Manterola, Héctor Javier, María de la Paz Ramos Lara, and Guadalupe Cordero. “Interpretation of the Observations Made in 1883 in Zacatecas (Mexico): A Fragmented Comet That Nearly Hits the Earth.” arXiv:1110.2798 (2011).arXiv:1110.2798 | Preprint | interpretation |
Developments
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