1. Preface

   • Joseph S. Mikhail
   • Hans J. Haubold

   EditorialNotes Pages: vii - xi

2. Sun, earth and sky

   • Kenneth R. Lang

   OriginalPaper Pages: 1 - 20

3. Impact cratering - a review, with special reference to the economic importance of impact structures and the Southern African impact crater record

   • W. U. Reimold

   OriginalPaper Pages: 21 - 45

4. Description of the trajectory functions of TOPEX/POSEIDON navigation

   • Ahmed Salama
   • Julie Kangas

   OriginalPaper Pages: 47 - 60

5. The linke turbidity factor and Ångström coefficient in humid climate of Bahrain

   • W. E. Alnaser
   • N. S. Awadalla

   OriginalPaper Pages: 61 - 74

6. Greenhouse effect and related problems

   • V. M. Canuto

   OriginalPaper Pages: 75 - 78

7. The space debris environment of the Earth

   • Walter Flury

   OriginalPaper Pages: 79 - 91

8. Visibility of the new Moon at two sites I: Maryland situated at northern geographical latitude. II: Sacramento peak situated at high altitude above sea level

   • J. S. Mikhail
   • A. S. Asaad
   • N. Y. Hassanin

   OriginalPaper Pages: 93 - 108

9. Improving the crescent visibility limits due to factors causing decrease in the sky twilight brightness

   • J. S. Mikhail
   • A. S. Asaad
   • N. Y. Hassanin

   OriginalPaper Pages: 109 - 121

10. Variation of evening Zenith sky twilight brightness and colour at Abu-Simbel during spring

    • S. Nawar
    • J. S. Mikhail

    OriginalPaper Pages: 123 - 131

11. Light pollution and night sky brightness at the site of Kottamia Observatory

    • S. Nawar
    • A. B. Morcos
    • J. S. Mikhail

    OriginalPaper Pages: 133 - 141

12. Decrease in the clear air transmission at Helwan Observatory site

    • J. S. Mikhail
    • B. B. Baghos
    • M. Ibrahim

    OriginalPaper Pages: 143 - 149

13. Power spectrum of geomagneticK _p-index detected at Misallat magnetic station

    • A. A. Galal
    • H. A. Deebes
    • Shahinaz Yousef

    OriginalPaper Pages: 151 - 162

14. Solar-terrestrial relations and geomagnetic variations

    • S. O. Ogunade

    OriginalPaper Pages: 163 - 171

15. North-South asymmetry of the daily interplanetary magnetic field spiral during the period: 1965–1990

    • I. Sabbah

    OriginalPaper Pages: 173 - 178

16. Potential of interplanetary torques and solar modulation for triggering terrestrial atmospheric and lithospheric events

    • Rhodes W. Fairbridge
    • Hans J. Haubold
    • Göran Windelius

    OriginalPaper Pages: 179 - 181

17. Description of the Martian polar cap breeze

    • Walter Fernández

    OriginalPaper Pages: 183 - 191

18. A numerical simulation of the Martian polar cap breeze

    • Walter Fernández

    OriginalPaper Pages: 193 - 205

19. High resolution imaging of Pluto and Charon with the Faint Object Camera of the Hubble Space Telescope

    • R. Albrecht

    OriginalPaper Pages: 207 - 212

20. Differential Radial Velocity Spectrometer for extrasolar planetary studies

    • Rajendra Vikramsingh

    OriginalPaper Pages: 213 - 220

21. Appendix: Observations and recommendations

    Legacy Pages: 221 - 229