# Black drop effect

> optical phenomenon during a transit of Venus and Mercury

**Wikidata**: [Q1367380](https://www.wikidata.org/wiki/Q1367380)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Black_drop_effect)  
**Source**: https://4ort.xyz/entity/black-drop-effect


## References

1. Freebase Data Dumps. 2013