Ontario, CA: White triangle sighted by investigator
On February 26, 1977, at 9:00 p.m., an accident investigator in Ontario, California, observed a large white triangle with rounded edges, comparable in size to the full moon. It traveled silently eastward at a 45-degree elevation, altered course twice over 4-5 minutes, then vanished.
Background
Witness and Observation
An accident investigator in Ontario, California saw a white triangular object with rounded sides on February 26, 1977 at 21:00. It was as large as the full moon and moved silently and slowly from the zenith eastward at about 45 degrees elevation.
Flight Path and Maneuvers
The object changed direction twice over the next 4–5 minutes before disappearing into the distance. Its slow, silent movement and precise course corrections set it apart from conventional aircraft.
Sources and Significance
Documented as "Case 2-4-21" in IUR 2, no. 4 (April 1977): 6, from Eberhart's "UFOs and Intelligence: A Timeline" (p. 838). The case is among the reports of triangular UAP with unusual manoeuvrability, typical of 1970s sightings without radar or photographic evidence.