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ROMANIAN ASTRONOMICAL JOURNAL

Vol. 30 , No. 1, 2020

C O N T E N T S

C. DUMITRACHE, N.A. POPESCU

In Memoriam Ieronim Mihˇailˇa . . . 3 M. STANGL, U. FOELSCHE

The Sp¨orer and Maunder minima of solar activity and the climate

in Central Europe . . . 9 B. RACSK ´O, L. ´A. GERGELY

Null shells in kinetic gravity braiding scalar-tensor theories . . . 25 D. R. CONSTANTIN, V. I. R. NICULESCU, A. A. MOCANU, D. PRICOPI, E. VEREBELYI-VARGA

The orbitals of Rydberg atom . . . 35 C. GERGELY, Z. KERESZTES, L. ´A. GERGELY

2+1+1 general relativistic Hamiltonian dynamics and gauge fixing in

Horndeski gravity . . . 43 P. SRIRAMACHANDRAN, S. NIRMALADEVI, R. VIJAYALAKSHMI,

H. NEERAJA, R. SHANMUGAVEL

Estimation of effective rotational temperature from spectral lines of

YO molecule in sunspot spectrum . . . 53 Z. KERESZTES, B. MIK ´OCZI

The motion and spin evolution of extended bodies in

rotating black hole spacetimes . . . 59

Romanian Astron. J. , Vol. 30, No. 1, p. 1- 88, Bucharest, 2020

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2 (c) 2020 RRP

M. STAVINSCHI

Jean Dragesco at his 100th anniversary! . . . 81 C. DUMITRACHE

In Memoriam Tiberiu Oproiu (1939 – 2020) . . . 87

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