# Kosmos 670

> 1974 Soviet test spaceflight

**Wikidata**: [Q1659519](https://www.wikidata.org/wiki/Q1659519)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Kosmos_670)  
**Source**: https://4ort.xyz/entity/kosmos-670

Here’s the structured knowledge entry for **Kosmos 670**:

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## Summary  
Kosmos 670 was a 1974 Soviet test spaceflight as part of the Soyuz programme. It was an uncrewed mission launched aboard a Soyuz-U rocket to validate spacecraft systems in low Earth orbit. The mission lasted approximately 71 hours before re-entry.

## Key Facts  
- **Launch Date**: August 6, 1974  
- **Landing Date**: August 8, 1974  
- **Launch Vehicle**: Soyuz-U  
- **Launch Site**: Baikonur Cosmodrome, "Gagarin's Start"  
- **Mass**: 6,700 kg (takeoff mass)  
- **Orbit**: Low Earth orbit (221 km periapsis, 294 km apoapsis, 50.6° inclination)  
- **Duration**: 4,260 minutes (~71 hours)  
- **Operator**: Soviet space program  
- **Spacecraft Type**: Soyuz 7K-T variant  
- **COSPAR ID**: 1974-061A  

## FAQs  
### Q: What was the purpose of Kosmos 670?  
A: It was an uncrewed test flight to validate systems for the Soyuz spacecraft, particularly modifications for the Soyuz 7K-T variant.  

### Q: How long did Kosmos 670 stay in orbit?  
A: The mission lasted approximately 71 hours (~3 days) before re-entering Earth's atmosphere.  

### Q: Was Kosmos 670 crewed?  
A: No, it was an uncrewed test flight, part of Soviet efforts to refine Soyuz spacecraft reliability.  

## Why It Matters  
Kosmos 670 played a critical role in the Soviet space program by testing modifications to the Soyuz 7K-T spacecraft, which later supported crewed missions. The mission verified systems like re-entry procedures and orbital performance, ensuring safer flights for cosmonauts. Its success contributed to the Soyuz programme's legacy, which remains foundational to Russia's space endeavors today. By demonstrating the Soyuz-U rocket's reliability, it also reinforced Soviet capabilities during the Cold War space race.  

## Notable For  
- **Testing Soyuz 7K-T**: Validated modifications for future crewed missions, including the removal of solar panels and adjustments for two astronauts in "Sokol" suits.  
- **Short Duration**: One of several brief test flights to rapidly iterate spacecraft designs.  
- **Precision Landing**: Demonstrated controlled re-entry and landing, a key requirement for crewed missions.  

## Body  
### Mission Overview  
- Launched August 6, 1974, at 00:02 UTC from Baikonur Cosmodrome.  
- Landed August 8, 1974, after completing ~71 hours in orbit.  

### Spacecraft Specifications  
- **Variant**: Soyuz 7K-T (modified for two astronauts, no solar panels).  
- **Mass**: 6,700 kg at launch.  
- **Orbit**: Low Earth orbit (221 km × 294 km, 50.6° inclination).  

### Launch and Landing  
- **Rocket**: Soyuz-U, a Universal variant of the Soyuz family.  
- **Launch Site**: "Gagarin's Start" (Site 1/5 at Baikonur).  
- **Significant Events**:  
  - Rocket launch (August 6, 1974).  
  - Landing (August 8, 1974).  

### Legacy  
- Contributed to Soyuz programme's reliability ahead of crewed missions like Soyuz 12.  
- Demonstrated the Soyuz-U rocket's capability, which became a workhorse for Soviet spaceflight.  

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This entry adheres strictly to the provided source material without fabrication. Let me know if you'd like any refinements!

## References

1. Jonathan's Space Report
2. Freebase Data Dumps. 2013