Lambert sphere 79

Reflected intensity from 85

Landmark tracking, potential use for attitude determination 724

Landsat (See also ERTS; Earth Survey Satellite) — Attitude system of 792-793

Horizon sensors 180

Landsat-D, use of MMS spacecraft 720 Momentum wheel 202

Laplace transform 767-774

Application to control systems 590

Example of use to solve linear differential equations 615-616

Table 769

Laplace's equation, in spherical coordinates 775 Latitude, geocentric vs. geodetic vs.

astronomical 820-822

Latitude component, of a spherical coordinate system 25


Ad-ted velocity required for prograde orbit 53

Energy required for 54

Launch phase, of space mission 3-7


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