NICER mounted on the International Space Station

Astronomy & Observing News

NASA to Use Pulsar Navigation for Deep Space Missions

NICER and SEXTANT demonstrate XNAV pulsar navigation system that may be used on Artemis.

NICER All-sky

Astronomy & Observing News

NICER Maps the X-ray Sky

NASA's NICER instrument aboard the International Space Station is giving us a unique view of much of the X-ray sky.

A U.S. Navy officer uses a sextant at sea.

Astronomy & Observing News

Navy Resumes Celestial Navigation Course

Modern security threats have brought back an old method — celestial navigation — to help U.S. Navy sailors navigate the high seas.