CONTENTS VOLUME 77 Vol. 77 No. 1 2000 ERNESTO A. LACOMBA and JAUME LLIBRE / On the Dynamics and Topology of the Elliptic Rectilinear Restricted 3-Body Problem S. BLANES, F. CASAS and J. ROS / Processing Symplectic Methods for Near-Integrable Hamiltonian Systems T. G. VOZMISCHEVA /C lassification of Motions for Generalization of the Two Centers Problem on a Sphere S. V. BOLOTIN and R. S. MACKAY / Periodic and Chaotic Trajectories of the Second Species for the n-Centre Problem Vol. 77 No. 2 2000 ALAIN ALBOUY and RICHARD MOECKEL / The Inverse Problem for Collinear Central Configurations K. H. TSUI / Celestial n-Body Coupling in the Lunar Orbit Theory ROMAN TOMASCHITZ / Superluminal Kinematics in the Milne Uni- verse: Causality in the Cosmic time Order SLAWOMIR BREITER and MARCIN BUCIORA / Explicit Symplectic Integrator for Rotating Satellites ALAIN CHENCINER et ANDREA VENTURMiEnimLa DLe LI in/tgra le D’ action du Probleme Newtonien de 4 Corps de Masses Egales Dans R°: Orbites ‘Hip-Hop’ Vol. 77 No. 3 2000 ANTONIO GIORGILLI / A Tribute to Jiirgen Moser P. PD, HALLAN, SANJAY JAIN and K. B. BHATNAGAR / The Non Linear Stability of L4 in the Restricted Three-Body Problem when the Bigger Primary is a Triaxial Rigid Body BRUNO CORDANI / Perturbations of the Kepler Problem in Global Coordinates SLAWOMIR BREITER/ The ProgradeC 7 Resonance for Earth and Mars Satellite Orbits SERGEI A. KLIONER / Numerical Fourier Expansions of the Planetary Disturbing Function Be Celestial Mechanics and Dynamical Astronomy 77: 325-326, 1999 Vol. 77 No. 4 2000 A Tribute to William M. Kaula 239-240 PETER KAMMEYER / A UT1-Like Quantity from Analysis of GPS Orbit Planes 241-272 MONTSERRAT CORBERA and JAUME LLIBRE / Periodic Orbits of the Sitnikov Problem Via a Poincaré Map 273-303 SEPPO MIKKOLA and PHIL PALMER / Simple Derivation of Sym- plectic Integrators with First Order Correctors 305-317 Instructions to authors 319-324 Volume contents 325-326