observational

He was hardly a practical astronomer in the observational sense.

In twelve months observational astronomy had made such a bound as it has never made before or since.

These are the palmiest days in the eventful history of physical and observational astronomy.

The observational method applied to consciousness gives us the science of psychology.

This first and oldest branch is known as "observational," or "practical astronomy."

Lesser discrepancies were at that time regarded as falling within the limits of observational error.

For the most part it has been an observational rather than an experimental study.

It is apparent that our observational knowledge of the atmosphere is gained by two general methods of exploring it, viz.

Religion also has its observational work in the larger and possibly more arduous manner.

I assure you, Mr. Payne, our visit to Earth was intended purely for observational purposes!