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INTERNATIONAL ASTRONOMICAL UNION Proc. N. A. S. 
VII — Regulations 
18. The General Assembly may draw up regulations for the conduct of its business, 
the general duties to be assigned to the officers of the Union, and all matters not provided 
for in the Convention. 
Bach standing Committee may draw up its own regulations, which shall be approved 
by the General Assembly before coming into force. 
No regulation shall be made, either by the General Assembly or by the Standing 
Committees, which violates the term of the present Convention. 
VIII — Duration of Convention and Modifications 
19. The present Convention shall remain in force until December 31, 1931. It 
may then, with the assent of adhering countries, be continued for a further period of 
twelve years. 
20. No change shall be made in the terms of the Convention except with the approval 
of two-thirds of the votes of the adhering countries. 
21. The French text (of which the above is a translation) shall be considered to be 
the authoritative text. 
IntkrnationaIv Research Council 
INTERNATIONAL ASTRONOMICAL UNION 
International Time Commission 
Regulations 
1. An International Time Commission shall be formed for the purpose of unifying 
time by means of radio-telegraphic or other signals, whether these are scientific signals 
of great precision, or ordinary signals adapted to the needs of navigation, meteorology, 
seismology, railways, postal and telegraphic services, public administration, clock- 
makers, individuals, etc. 
2. The domicile of the Commission shall be located at Paris. 
3. The Bureau shall consist of a President, a Vice-President, and a General Secre- 
tary ; the latter two shall be elected by the Commission itself. The General Secretary, 
whose tenure of office shall terminate on December 31, 1931, shall fulfil the functions 
of Director of the International Time Bureau. 
4. The purpose of the International Time Bureau, located at the National Observa- 
tory of Paris, is: 
(a) As regards ordinary signals, to harmonize the determinations of universal time, 
expressed in Greenwich Time, which shall be transmitted to them by the National 
Time centers. These shall be responsible for calculating, with the highest obtainable 
precision, the mean time, as deduced from determinations made by the Observatories 
of their respective countries. These results shall be sent as quickly as possible to 
the emitting stations and to the National Centers. 
{h) As regards scientific signals of precision, to harmonize the time determinations 
made by the associated observatories, and deduce from them the most exact time. 
The International Time Bureau shall publish the results of its comparisons. Any 
result whose publication is delayed shall be communicated in detail to all scientific 
associations and official institutions which may send in a request to that effect. 
5. In addition to the Director, the International Time Bureau shall consist of: 
(a) Scientific collaborators, nominated and dismissed by the Commission, on the 
proposal of the Director of the International Bureau. They shall be charged, with 
or without indemnification, with the conduct of special studies. Their term of office 
shall not exceed two years, but they shall be re-eligible. 
