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