Results 61 to 70 of about 2,402 (235)
A MODIFICATION OF GAUSS' METHOD FOR PRELIMINARY DETERMINATION OF A CELESTIAL BODY'S ORBIT
Odessa Astronomical Publications, 2016 A modification of classical Gauss’ method for determination of Keplerian elements from the observed positions is considered in this paper. The modification involves the exhaustive enumeration of all possible orbital plane positions in order to improve ...
A. A. Bazyey
doaj +1 more source
Resultant Force on Grains of a Real Sand Dune: How to Measure It?
Geophysical Research Letters, Volume 52, Issue 15, 16 August 2025.Abstract Barchan dunes usually appear under the action of one‐directional fluid flows, being found on Earth, Mars, and other celestial bodies; however, although ubiquitous in nature, understanding dune dynamics at the grain scale is challenging due to the vast number of grains involved.
R. F. Miotto +4 more
wiley +1 more source
On Equilibrium Figures of Particle Clouds around the Sun and Stars
Open Astronomy, 2015 Equilibrium figures of cold gas-dust (or cometary) clouds are studied in a more general setting than the classical Roche problem. The cloud is considered to be under the influence of gravitational attraction of the central star and the tidal field of the
Kondratyev B. P., Trubitsina N. G.
doaj +1 more source
Docent Borisas Voronkovas (1911–1987) 100 years
Lietuvos Matematikos Rinkinys, 2011 B. Voronkovas life review. Scientific work. Bibliographical listing.
Vytautas Merkys +2 more
doaj +1 more source
The Unreasonable Effectiveness of the nΣv Approximation
The Astrophysical JournalIn kinetic theory, the classic n Σ v approach calculates the rate of particle interactions from local quantities: the number density of particles n , the cross section Σ, and the average relative speed v .
Elisha Modelevsky +2 more
doaj +1 more source
Remarks on the progress of celestial mechanics since the middle of the century [PDF]
, 1896 George William Hill
openalex +1 more source
Dynamical Structures Associated with High-Order and Secondary Resonances in the Spin–Orbit Problem
The Astronomical JournalIn our solar system, spin–orbit resonances are common under Sun–planet, planet–satellite, and binary asteroid configurations. In this work, high-order and secondary spin–orbit resonances are investigated by taking numerical and analytical approaches ...
Hanlun Lei
doaj +1 more source
C. Joint Discussion on the Demands Made on Celestial Mechanics by the Preparation of Ephemerides [PDF]
, 1962 F. Arend +4 more
openalex +1 more source
Dynamical Structures under Nonrestricted Hierarchical Planetary Systems with Different Mass Ratios
The Astronomical JournalSecular dynamics have been extensively studied in both the inner and outer restricted hierarchical three-body systems. In the inner restricted problem, the quadrupole-order resonance (i.e., the well-known Kozai resonance) causes large coupled ...
Xiumin Huang, Hanlun Lei
doaj +1 more source