# Zond 4

> 1968 Soviet test spaceflight

**Wikidata**: [Q668831](https://www.wikidata.org/wiki/Q668831)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Zond_4)  
**Source**: https://4ort.xyz/entity/zond-4

## Summary
Zond 4 was a 1968 Soviet test spaceflight of the Soyuz 7K-L1 spacecraft, launched to conduct uncrewed lunar flyby tests. It was launched on March 2, 1968, from Baikonur Cosmodrome Site 81/23 using a Proton-K carrier rocket. The mission was part of the Soviet lunar program but did not achieve its intended lunar trajectory.

## Key Facts
- Launched on March 2, 1968, from Baikonur Cosmodrome Site 81/23
- Launched using Proton-K carrier rocket
- Spacecraft type: Soyuz 7K-L1
- COSPAR ID: 1968-013A
- Spacecraft catalog number: 03134
- Wikipedia title: Zond 4
- Available in 10 Wikipedia languages including English, Spanish, and Russian
- Sitelink count: 15

## FAQs
### Q: What was the purpose of Zond 4?
A: Zond 4 was a Soviet test spaceflight designed to conduct uncrewed lunar flyby tests as part of the Soyuz 7K-L1 program. It was launched in 1968 to evaluate spacecraft systems for future crewed lunar missions.

### Q: When and where was Zond 4 launched?
A: Zond 4 was launched on March 2, 1968, from Site 81/23 at the Baikonur Cosmodrome in Kazakhstan using a Proton-K carrier rocket.

### Q: What type of spacecraft was Zond 4?
A: Zond 4 was a Soyuz 7K-L1 spacecraft, which was a modified version of the Soyuz spacecraft specifically designed for lunar flyby missions.

## Why It Matters
Zond 4 represents a significant milestone in the Soviet lunar program during the Space Race era. As an uncrewed test flight, it provided crucial data about the performance of the Soyuz 7K-L1 spacecraft and the Proton-K launch vehicle in deep space conditions. Although the mission did not achieve its intended lunar trajectory, the test flight was essential for identifying technical challenges and improving subsequent missions. The Zond program, including Zond 4, was part of the Soviet Union's efforts to achieve lunar exploration capabilities and compete with American space achievements. These test flights laid the groundwork for later successful lunar missions and contributed to the advancement of space technology and exploration capabilities.

## Notable For
- First test flight of the Soyuz 7K-L1 spacecraft for lunar missions
- Part of the Soviet Union's lunar exploration program during the Space Race
- Used the Proton-K carrier rocket, a key Soviet heavy-lift launch vehicle
- Contributed to the development of spacecraft systems for deep space missions
- Represented Soviet efforts to achieve lunar flyby capabilities before the United States

## Body
### Mission Overview
Zond 4 was launched on March 2, 1968, as part of the Soviet lunar program. The mission aimed to test the Soyuz 7K-L1 spacecraft's capabilities for future lunar flyby missions. The spacecraft was launched from Baikonur Cosmodrome Site 81/23 using a Proton-K carrier rocket.

### Technical Specifications
The spacecraft was designated with the catalog number 03134 and assigned the COSPAR ID 1968-013A. As a Soyuz 7K-L1 spacecraft, it was specifically modified for lunar missions, featuring enhanced systems for deep space operations compared to standard Soyuz spacecraft used for Earth orbit missions.

### Launch Vehicle
The Proton-K rocket, a heavy-lift launch vehicle developed by the Soviet Union, was used to launch Zond 4. This rocket had become the primary launch vehicle for the Soviet lunar program and would continue to be used for various space missions throughout the following decades.

### Program Context
Zond 4 was part of the broader Zond program, which consisted of robotic spacecraft missions designed to support the Soviet lunar exploration efforts. These missions were precursors to potential crewed lunar flights and were conducted in parallel with the American Apollo program during the height of the Space Race.

## References

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