Ground-based observations of lower thermospheric emission originating from OH(8-3) rotation lines P1,2 at 7316.4 ¿ and P2.3 at 7330 ¿ were made with an intensified imaging Fabry-Perot interferometer from Santa Cruz, California, on September 25 and 26, 1987, during a CEDAR campaign. The rotational lines were imaged simultaneously from four different atmospheric volume elements which were separated by ~15 km north to south and ~30 km east to west. Two types of analysis are performed on the data. First, traditionally observed temporal structure in the rotational temperature showed acoustic gravity wave-like periods which are compared to other experimental data. Spectral analysis on the data shows the traditional gravity wave characteristics for specific periods in four separated atmospheric volumes which were sampled simultaneously. Second, the simultaneous multiple-point sample provides a measurement of horizontal phase velocity. Spectral components of temperature variation exhibited phase coherence in all four spatial regions, indicating wave phenomena of length scales ≫30 km. Gravity wave &eegr; versus period data are compared with the theories of Schubert and Walterscheid (1988) and Hickey (1988a, b). ¿American Geophysical Union 1990