The Sagnac effect (also called Sagnac interference), named after French physicist Georges Sagnac, is a phenomenon encountered in interferometry that is elicited by rotation.

The Norwegian Defence Research Establishment (FFI) is actively contributing to the International Earth Rotation Service through analysis of global positioning system (GPS) and very long baseline interferometry (VLBI) measurements.

I have no doubt that sometime later this century, one will be able to buy pocket professors perhaps with holographic images as easily as one can buy a pocket Kasparov chess computer today.

The International Radioastronomical Centre of Ventspils University College is participating in two projects within the Sixth Framework Programme the European radio astronomy programme RadioNet and Express Production Real Time electronic Very Long Baseline Interferometry Service.

See also Gamma ray burst Hypernova Starburst galaxy Wolf Rayet nebula WR 104 References External links physics.usyd.edu.au Some Wolf Rayet stars in binaries are close enough that we can image a rotating pinwheel nebula showing the dust generated by colliding winds in the binary system, from Aperture Masking Interferometry observations.

A staff security plan was completed and put in place at the Headquarters complex, tamper proof holographic building passes were introduced, a crisis management plan was put in place at all duty stations and anti blast film was installed on all windows in the Secretariat building and all the annex buildings in New York.