# Petrozavodsk phenomenon

> series of celestial events of a disputed nature that occurred on September 20, 1977

**Wikidata**: [Q4361469](https://www.wikidata.org/wiki/Q4361469)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Petrozavodsk_phenomenon)  
**Source**: https://4ort.xyz/entity/petrozavodsk-phenomenon