4 papers
Discontinuity in the Brightness of the Twilight Sky at Different Wavelengths
S. Nawar, A. B. Morcos, A. L. Tadross +1
A search for discontinuity in the sky twilight brightness at different wavelengths and different solar depressions for altitudes 0, 5, 10, 30, 50 & 70 degrees is done. It is found…
Brightness and color of the integrated starlight at celestial, ecliptic and galactic poles
S. Nawar, A. L. Tadross, J. S. Mikhail +1
From photoelectric observations of night sky brightness carried out at Abu-Simbel, Asaad et al. (1979) have obtained values of integrated starlight brightness at different Galactic…
Theorems on Null-Paths and Red-Shift
M. I. Wanas, A. B. Morcos
In the present work, we prove the validity of two theorems on null-paths in a version of absolute parallelism geometry. A version of these theorems has been originally established…
Application of Theorems on Null-Geodesics on the Solar Limb Effect
F. I. Mikhail, M. I. Wanas, A. B. Morcos
A direct and more general calculation of the limb effect connected with red-shift observations is obtained. Result agrees completely, in its general form, with that obtained from o…