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Titlebook: Reports on Astronomy/Proceedings of the Thirteenth General Assembly Prague 1967; Luboš Perek (General Secretary of the Union) Conference p

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Commission de L’Activite Solaire problems of Solar Physics or solar cyclic variations can be deduced from them. We have included all the remaining papers concerning solar activity published since the beginning of 1964 and very few papers which appeared in 1963 and clearly could not be included into the last Professor Severny’s Report.
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Commission des Positions et des Mouvements des Petites Planetes, des Cometes et des Satellitesson is that nearly all significant observations now need to be in the range of one or two magnitudes fainter than have formerly been useful. Another is that the efforts to secure a suitable instrument for conducting another survey such as the Yerkes-McDonald survey of 1950–52 have not been successful as yet.
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Commission des Ephemerides7, 8, 19, 20, and 31: ‘The International Astronomical Union endorses the final list of constants proposed by the Working Group on the System of Astronomical Constants and recommends that it be used in the national and international astronomical ephemerides at the earliest practicable date.’
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