Sommaire

Contents
The behaviour of the polarization of polydisperse interplanetary cloud
p. 3-10
Profiles of some craters from ranger lunar photographs
p. 11-23
Diameter-depth relationship of craters on Mars
p. 25
Observations of comets at the Kleť observatory in the year 1969
p. 29-39
Surges in cometary brightness and observational errors
p. 41-43
Total solar eclipse of March 7, 1970, and the form of the solar corona
p. 45-47
Transit of Mercury of May 9, 1970
p. 49-50
Tables of the brillouin function
p. 51-76
The kinematic and dynamic properties of seismic waves in the neighbourhood of caustics
p. 77-106