Proceedings of the XXth International Astronautical Congress

Part 1: Spacecraft Engineering

Invited Lecture: Extensions of Apollo

§1.1 Systems Design

The Effect of Environment on the Materials, Structures and Design of Space Vehicles

Equatorial Vibrations of a Long Flexible Boom on a Spin-Stabilized Satellite of Non-Zero Radius

Future Launch Vehicle with Multi-Mission Capability, Using High-Energy Propulsion Systems

Small Astronomy Satellite Thermal Design and Test

Recent Advances in Spacecraft Thermal-Control Materials Research

§1.2 Scientific and Application Satellites

The Orbiting Geophysical Observatories

The Global Photography of the Earth and the Possibilities of Data Interpretation

Orbital Deployment of Very Long Tethered Structures

Delta-A Scientific and Application Satellite Launch Vehicle

Remote Manipulator Spacecraft Systems

Flight Research Operations in the BOMEX Project Based on Real-Time Synchronous Satellite Information

Synthesis of Requirement for Advanced Earth Resources Sensors

Multispectral Discrimination of Possible Martian Surface Constituents

Determination of Orbit and Attitude of Artificial Satellites of Planets and Some Gravity and Astronomical Constants from Earth-Based Radio Doppler and Orbital Photogrammetric Observations

§1.3 Propulsion Systems

Advanced Propulsion Systems for Space Flight

Status of the Nuclear Rocket Propulsion Program

Propulsion d'engins Spatiaux au Moyen d'un Réacteur Nucléaire de Faible Puissance

Theory of Accelerated Rocket Nozzles

Comparison of the Potentialities of Various Electric Propulsion Systems

Orientations Retenues dans le Developpements de la Propulsion Ionique et Objectifs Actuels d'application

Propulseurs Hybrides à Fragmentation de Combustible Solide

Thermoelectric Generators for Deep Space Application

Power Systems for Permanent Lunar Stations

Design Considerations for a Supersonic Combustion Facility and Discussion of Pertinent Research Areas

Scientific Results Obtained in the Flight of the Automatic Ionospheric Laboratories Yantar (in Russian with English Summary)

§1.4 Re-Entry Problems

Prediction of Thermal Fluxes to Very Blunt Planetary Entry Vehicles by the Integral Method

Heat Transfer to Linear Bodies in Two-Dimensional Hypersonic Low Density Flow

Part 2: Astrodynamics

§2.1 Flight Trajectories

On the Helicoid Precession: Its Stability and an Application to a Re-Entry Problem

Interstellar Drag and Its Effect on Minimum-Time, Acceleration-Limited Relativistic Rocket Trajectories

A Universal, Singularity-Free Determination of an Orbit for Two Positions and Time Interval

Limits of Accuracy of General Perturbations for Satellites Moving Under Constant Forces

Optimum Strategy Selection for Orbit Determination

§2.2 Motion Around the Center of Gravity

Effect of Atmosphere on Attitude Dynamics of Axi-Symmetric Satellites

Attitude Dynamics of Slowly Spinning Axi-Symmetric Satellites Under the Influence of Gravity Gradient Torques

§2.3 Optimization

Optimal Control for Synergetic Plane Change

Analytical Solutions of a Class of Optimum Orbit Modifications

Rapid Optimization of Multiple-Burn Rocket Flights

Part 3: Astrionics

§3.1 Trajectory Control

An Analytical Approach for Determining an Approximately Optimal Control and an Explicit Closed Loop Guidance Strategy

Computers and Astronautics: Current and Future Trends and Some Implications

Data Transmission for Planetary Studies

§3.2 Attitude Control

The Mariner Spacecraft Star Tracker

Mariner IV Revisited, or the Tale of the Ancient Mariner

Comparison of Theoretical and Experimental Attitude Data for the DODGE Spacecraft

Dispositif de Contrôle d'attitude Cassiopée: Premiers Essais en Vol

Part 4: Bioastronautics

Apollo Life-Support and Protective Systems

Zero-Gravity Testing of a Waste Management System

Biological Life-Support System Containing Lower and Higher Plants (in Russian)

Bioastronautical Aspects of Apollo Biomedical Operations

Some Results of Experiments with Plant Objects Exposed Aboard the Zond-5 Probe

Simulated Weightlessness Conditions in Animal Development

Part 5: Problems of Education

§5.1 Education Via Satellites

Broadcasting from Space—Closer to Reality 1969

Meghdoot—the Cloud-Messenger

Some Aspects of a Satellite Educational System for Argentina and South America

Television Distribution by Satellite for Education and Other Purposes

§5.2 Safety in Youth Rocket Experiment (SYRE)

La Fusée Sonde Vera 15

Le Problème de la Securité des Lancements de Fusées par des Clubs de Jeunes en France

Youth Rocket Activities in Sweden

Hot Water Rockets, Development and Applications

Editor's Note