1.   The instruments provide accurate measurement of atmospheric conditions.

2.   The images that the Landsat MSS and TM instruments provide are digital or numerical in nature, and can therefore be processed by computer.

3.   Earth-bound weather instruments provide a different perspective.

4.   Early keyboard instruments can provide invaluable road maps through the Classical era and onward through Beethoven and Schubert.

5.   Other instruments may be providing an explanation.

6.   Other instruments provide backup information that validates the artificial horizon.

7.   The medium-angle instrument should provide more detailed pictures of surface changes related to weather and seasonal conditions.