Series of celestial events of a disputed nature that occurred on September 20, 1977
A widely observed but unexplained atmospheric event over the USSR in 1977 that prompted diplomatic concern and led to a formal Soviet anomalous phenomena research program.
Key Facts
- Date of occurrence
- 20 September 1977
- Geographic spread
- Copenhagen and Helsinki west to Vladivostok east
- Primary attributed cause
- Launch of Soviet satellite Kosmos-955
- Reporting body
- Academy of Sciences of the USSR
- Research program created
- Setka AN (Soviet anomalous atmospheric phenomena program)
Location
Cause → Event → Consequence
On 20 September 1977, an unidentified glowing object appeared over a vast stretch of territory from Scandinavia to the Soviet Far East. The Soviet satellite Kosmos-955 was launched on the same date and has since been widely, though not universally, cited as the likely origin of the observed lights and rays.
Observers across a wide region reported a glowing object that showered Petrozavodsk with numerous rays. The event generated visual observations, radiolocation data, physical measurements, and meteorological records, which were compiled into a preliminary report for the Academy of Sciences of the USSR. The report concluded that the phenomenon could not be satisfactorily explained with available data.
Northern European governments wrote to the president of the Soviet Academy of Sciences expressing concern about potential weapons testing and environmental harm. The incident contributed directly to the establishment of Setka AN, a Soviet state research program dedicated to studying anomalous atmospheric phenomena, marking an institutional response to unexplained aerial events.