Résolution 1. — In order to remedy the inconsistencies and inadequacies of the present system of astronomical constants, and to take account of the better determination of such constants provided by recent observations, we recommend that the national and international ephemerides should be based on an improved system of astronomical constants; and that this system should be put into use as soon as it is practicable to the Ephemeris Offices. The new system shall be defined by a non-redundant set of fundamental constants, and by explicit relations between these and the constants derived from them.