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Article Contents

ABSTRACT

1.INTRODUCTION

2.DISTANCES IN THE SOLAR SYSTEM: THE ASTRONOMICAL UNIT

2.1.Relative vs. absolute sizes in the solar system

2.2.The astronomical system of units

2.3.The solar parallax

2.4.The astronomical unit today

3.DISTANCE OF THE STARS

3.1.The trigonometric parallaxes

3.2.The Hipparcos parallax survey

3.3.The Gaia parallax survey

4.SECONDARY INDICATORS

4.1.Overall principles

4.2.Distances of clusters

4.3.Distances from the Cepheids

4.4.Towards cosmological distances

5.CONCLUSION

REFERENCES