1. Episteme and gnosis: a tension in european thought

2. A new, rational endeavour for understanding the Eratosthenes numerical result of the earth meridian measurement

3. Astronomical activity in the period 1600 to 1880

4. The behaviour of adiabatic invariants near resonances

5. Radiation pressure effect on dust surrounding the Pleiades bright stars

6. Trapping of orbits in barred galaxies

7. On the stability of the asteroids

8. Solar magnetic fields and activity

9. The experimental curve of growth in function of different sets of oscillator strengths

10. Relations of solar activity indices

11. Increasing trend of flare activity before the proton flare april 30, 1976

12. Centimeter wavelength observations of active regions and flares with a few arc second resolution

13. A correlation between various indices of solar activity and solar cycles

14. Caractères météorologiques du climat, et activite solaire: quelques remarques

15. A suggested approach to research on the sun-weather problem

16. Observations of zodiacal light in Egypt and its variations

17. On the global size of Oort's cloud of cometary nuclei and their total number

18. Voyager encounters with Jupiter's magnetosphere: results of the low energy charged particle (LECP) experiment

19. The weather on Mars on the basis of the measurements carried out by the Vikings mission

20. On the origin of nebulae