Horizon Sensor, Earth/Lunar


Display Status:

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.

Collection Item Summary:

This is an unflown specimen of a sensor that located the horizon of the Earth or Moon by sensing the change in infrared radiation as the device scanned the horizon. After locating the horizon, it was able to determine the local vertical at that point. The sensor was probabaly used during the Gemini program, during missions where a Gemini spacecraft rendezvoused and docked with an Agena target vehicle.

NASA transferred it to the Museum in 1973.

Collection Item Long Description:

Inventory Number


Credit Line

Transferred from the National Aeronautics and Space Administration


Country of Origin

United States of America


  • Aluminum
  • Plastic
  • Stainless Steel
  • Brass
  • Copper
  • Glass
  • Paint
  • Paper
  • Adhesive


Overall: 6 5/8in. x 5 1/4in. (16.83 x 13.34cm)

Data Source

National Air and Space Museum

Restrictions & Rights

Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum