Question: What event, considered to be a birders principal meeting in South America, is held every orbital period of the Earth moving in its orbit around the sun?
Sentence (from "Sun-synchronous orbit"): This consistent lighting is a useful characteristic for satellites that image the Earth's surface in visible or infrared wavelengths (e.g. weather and spy satellites) and for other remote-sensing satellites (e.g. those carrying ocean and atmospheric remote-sensing instruments that require sunlight).
Relevant evidence: No