Artificial Satellites In recent years the sky watcher has become accustomed to see objects which have been placed there by the effort of man. ... in the western half of the sky and travel as star-like objects in undeviating paths across the sky, finally disappearing when they enter the shadow of the Earth. If the satellite is low , it moves very quickly and may be visible for only three or four minutes. ... Sometimes, owing to rotation, they vary obviously in brightness as did Sputnik II in particular.
|Title||:||The southern sky|