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	Lambert's problem (Lambert's problem)	Hohmann-överföring
Ämnesområde	Tillämpad fysik	Tillämpad fysik
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1761	1925
Upphovsperson	Johann Heinrich Lambert	Walter Hohmann
Typ	Orbital computation algorithm	Trajectory optimization algorithm
Ursprungskälla	Lambert, J. H. (1761). Acta Helvetica. Physico-Mathematico-Anatomico-Botanico-Medica.	Hohmann, W. (1925). Die Erreichbarkeit der Himmelskörper. R. Oldenbourg.
Alias	Lambert's problem, Lambert-Godstein trajectory problem	Hohmann-Vallado transfer, two-impulse maneuver
Närliggande	4	4
Sammanfattning	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.	The Hohmann transfer is a maneuver that transfers a spacecraft between two circular orbits using two impulsive burns (velocity changes). Introduced by German engineer Walter Hohmann in 1925, it is the most fuel-efficient method for coplanar orbital transfers when the transfer time is not severely constrained. The transfer orbit is an ellipse tangent to both the initial and final orbits.