Geometrical distortion of surface as seen from space 87

Gravitational field models 123-129 Horizon of (See Horizon) Illumination of as seen by nearby spacecraft 334 lnertial rotational position of (GST) 802-805

—Irregularities in 805

Infrared appearance of 90-98 Infrared radiation from 82, 90-98 Magnetic field (See Geomagnetic field)

Modeling procedures 82-110

Models of surface shape, table 98 Oblateness—

—Effect on orbit 65-69

—Modeling 98-106

—Term in gravitational potential 124 Orbit of (See also Ecliptic) 44, 4g-51

Path of conical scan on 87,178 Position of relative to Sun, Moon, and planets 138-142

Properties of, table 819-821

Radiation balance, table 82

Radiation from 82-98

Shadow cone of 75

Shape of 99-103

Symbol for 50 Terminator

—Identification 331-334

—Modeling 86-90

Thermodynamic equilibrium of 82

Torque due to reflected sunlight from 571 Visual appearance of 83-87

Earth-in (See In-triggering) Earth-Moon Lagrange points 55

Earth-out (See Out-triggering) Earth referenced spacecraft 605,608-625

Table of characteristics 612

Earth satellites, period vs. altitude table 828 Earth sensor (See also Horizon sensor) Combined Earth/Sun sensor 178-179 Visible vs. infrared 83,169

Earth-width measurement 172,347-349

Density of 348

Error due to unmodeled oblateness 10S Pagoda efTect in 336-339

Earth-width model, for horizon sensors

231,233-234 Earth-width/Sun angle single-axis attitude


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