Atmospheric calibration for precision Doppler tracking of spacecraft

Atmospheric Cherenkov telescope.

Atmospheric Dispersion Effects at the Diffraction Limit of TMT

Atmospheric dispersion effects in ELTs and their compensation

Atmospheric leakage and method for measurement of gas exchange rates of a crop stand at reduced pressure

Atmospheric lidar predevelopment program (ATLID)

Atmospheric seeing measurements in the near infrared

Atmospheric temperature change detection with GPS radio occultation 1995 to 2008

Atmospheric transmission model through autonomous visibility measurement

Atmospheric turbulence effects on the performance of multi-gigabit downlink PPM laser communications

Atmospheric turbulence measurements through stellar observations

Atomic and Astronomical Time

Atomic frequency standards - A survey

Atomic time and frequency standards development at Shanghai Observatory, China

ATP system target for performance scoring

Attainment of high D* at room temperature via gate-modulated detector interface

Attitude control for the Pluto Fast Flyby spacecraft

Attitude control system evaluator for NASA sounding rockets

Attitude control system for the Extreme Ultraviolet Explorer Satellite.

Attitude control system for the SIM interferometry testbed 3 (STB3)