Source: Earth Resources Technology Satellite Reference Manual

Diagram showing the flight profile of ERTS-1.

Diagram showing the flight profile of ERTS-1.

This schematic appears in theĀ ERTS Reference ManualĀ that was prepared by General Electric prior to the Landsat 1 (ERTS-1) launch in 1972.

The schematic shows the Landsat 1 flight profile, from liftoff (0) to spacecraft separation (10).

The manual tells us, “an all-inertial guidance system, consisting of an inertial sensor package and guidance computer, controls the vehicle and sequence of operations from liftoff to spacecraft separation. The flight profile is presented in [this figure] .”