1. Dirk Brouwer 1902–1966

   • J. M. A. Danby

   Announcement Pages: 2 - 2

2. Editorial

   EditorialNotes Pages: 3 - 5

3. How critical is the critical inclination?

   • Anthony G. Lubowe

   OriginalPaper Pages: 6 - 10

4. Comment on anthony G.Lubowe's paper ‘how critical is the critical inclination?’

   • Boris Garfinkel

   BriefCommunication Pages: 11 - 11

5. Canonical transformations depending on a small parameter

   • André Deprit

   OriginalPaper Pages: 12 - 30

6. Rotational locks for near-symmetric satellites

   • Frederick H. Lutze Jr.
   • Matt W. Abbitt Jr.

   OriginalPaper Pages: 31 - 35

7. Satellites and Riemannian geometry

   • Herbert Knothe

   OriginalPaper Pages: 36 - 45

8. Generalized multi-step methods with an application to orbit computation

   • Charles Sheffield

   OriginalPaper Pages: 46 - 58

9. Conservation laws and Liapounov stability of the free rotation of a rigid body

   • John P. Vinti

   OriginalPaper Pages: 59 - 71

10. Modified Newton-Raphson methods for preliminary orbit determination

    • Edward T. Pitkin
    • Gilbert C. Carpenter

    OriginalPaper Pages: 72 - 90

11. Ground traces of artificial earth satellites

    • Jack T. Kent
    • Harry R. Betz

    OriginalPaper Pages: 91 - 109

12. Perturbations in rectangular coordinates by iteration

    • R. Broucke

    OriginalPaper Pages: 110 - 126

13. Meeting Report: BSRL/JPL Seminar on the Lunar Motion

    • J. Derral Mulholland

    Report Pages: 127 - 129

14. Partial derivatives used in trajectory estimation

    • Frank H. Ditto

    OriginalPaper Pages: 130 - 140