Vol. 6, 1920 INTERNATIONAL ASTRONOMICAL UNION 
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to their fitness for planning, directing, and carrying on the American 
Section of the inter-allied program. 
3. That the selected primary stations be so distributed throughout 
both the southern and northern hemispheres as to cover, as uniformly as 
possible, the entire world, and to give suitable checks on the work. 
4. That observatories and other related institutions, both govern- 
ment and private, be encouraged to participate by receiving the funda- 
mental radio signals and making simultaneous time observations, so as 
to link up as many positions as possible with the primary stations. 
5. That the governments controlling radio stations likely to be of use 
be asked to give their consent to and promises of assistance in the work. 
6. That Greenwich, England, be so included in the plans that the 
differences of longitude between it and the primary stations will be ac- 
curately determined. 
7. That the determination of the difference of longitude between 
any pair or pairs of primary stations be made by parties from one country 
which would select their instruments and work out and be responsible 
for the result; but that nothing in this recommendation would prevent 
a duplication of this work by observers from another country, and, where 
other checks were not provided, that such duplication be encouraged. 
8. That in view of the many arrangements and preparations required 
to secure accurate and complete results, the earliest date practicable for 
an international determination of differences of longitudes is the winter 
of 1921-22. 
J. A. HooGEwHRFF, Chairman, W. W. CampbkIvIv. 
Because of his absence, Mr. J. J. Carty did not see the report. 
REPORT OF THE COMMITTEE ON VARIATION OF LATITUDE 
The Committee on Variation of Latitude of the American Section of 
the proposed International Astronomical Union submits the following 
report, based upon the action taken at a joint meeting of this committee 
with a similar committee representing the American Section of the pro- 
posed International Geophysical Union held in Washington on April 
29, 1919. There were present at the meeting Messrs. Bowie and Marvin 
representing the Geophysical Union and Messrs. Schlesinger, Leuschner, 
and Littell representing the Astronomical Union. Mr. Bowie acted as 
chairman and Mr. Littell as secretary of the meeting. 
R^COMMieNDATlONS 
The following recommendations are made by the committee : 
1. That the observations for variation of latitude, their reduction, 
and their publication be entrusted to the International Astronomical 
Union. 
