手法を比較

	ランベルト問題（Lambert's Problem）による軌道決定	宇宙論的摂動理論
分野	応用物理学	応用物理学
系統	Process / pipeline	Process / pipeline
提唱年	1761	1902
提唱者	Johann Heinrich Lambert	James Jeans
種類	Orbital computation algorithm	Theoretical framework and computational method
原典	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.
別名	Lambert's problem, Lambert-Godstein trajectory problem	structure formation theory, linear perturbations, growth of density fluctuations
関連	4	3
概要	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.