CHAPTER III

. THE METHOD OF LEAST SQUARES. Section I. Mean Values of

Quantities. II. Determination of Probable Errors. III. Equations of Condition. NOTES AND REFERENCES.

## PART II. THE FUNDAMENTAL PRINCIPLES OF SPHERICAL ASTRONOMY

## CHAPTER IV . SPHERICAL COÖRDINATES. Section I. General Theory. II.

Problems and Applications of the Theory of Spherical Coördinates.

## CHAPTER V . THE MEASURE OF TIME AND RELATED PROBLEMS. Section I. Solar

and Sidereal Time. II. The General Measure of Time. III. Problems Involving Time.

## CHAPTER VI . PARALLAX AND RELATED SUBJECTS. Section I. Figure and

Dimensions of the Earth. II. Parallax and Semi-diameter.

## CHAPTER VII . ABERRATION.

##