Comparer des méthodes

	Problème de Lambert (Détermination d'orbite)	Théorie des perturbations cosmologiques
Domaine	Physique appliquée	Physique appliquée
Famille	Process / pipeline	Process / pipeline
Année d'origine	1761	1902
Auteur d'origine	Johann Heinrich Lambert	James Jeans
Type	Orbital computation algorithm	Theoretical framework and computational method
Source fondatrice	Lambert, J. H. (1761). Acta Helvetica. Physico-Mathematico-Anatomico-Botanico-Medica.	Jeans, J. H. (1902). The stability of a spherical nebula. Philosophical Transactions of the Royal Society A, 199, 1-53.
Alias	Lambert's problem, Lambert-Godstein trajectory problem	structure formation theory, linear perturbations, growth of density fluctuations
Apparentées	4	3
Résumé	Lambert's problem is a classical astrodynamics boundary-value problem that determines an orbit connecting two points in space given a transfer time. Formulated by Johann Heinrich Lambert in the 18th century, it is fundamental to trajectory design for interplanetary missions and spacecraft maneuvers. The solution provides the orbital elements and velocities needed to transition between two positions.	Cosmological perturbation theory describes how small density fluctuations in the early universe grow into galaxies, clusters, and large-scale structure under gravity. Originating from James Jeans's 1902 stability analysis and extended by Lifshitz, Bardeen, and others, this theory is the foundation of structure formation cosmology. It explains how quantum fluctuations in the early universe—amplified by inflation—seeded the growth of all cosmic structures.