Eleven nations provided support to establish twelve observing stations around the Arctic.

There are 8 research groups and 2 observing stations in YAO.

Claremorris is home to one of Ireland's eight inland weather observing stations, located 2 kilometres from the town centre.

Observing the directions of the source as seen from the two observing stations provided the tiny angle at the apex of that extended triangle.

One-tenth of a second of arc was beyond the resolving power of the arrays at the two observing stations.

The information is then recalculated after all results (from observing stations, for instance), to give definitive results.

In practice, readings from all observing stations are averaged after adjustment with station-specific corrections to obtain the M value.

In 1886, the number of observing stations was over 600.

Russell prepared for the observation of the transit of Venus in 1874 for which four observing stations were equipped.

The team manned observing stations on three different islands.