BT MonocerotisW
BT Monocerotis
Intramedullary rodW
Intramedullary rod
May 1939 lunar eclipseW
May 1939 lunar eclipse
October 1939 lunar eclipseW
October 1939 lunar eclipse
Solar eclipse of April 19, 1939W
Solar eclipse of April 19, 1939
Solar eclipse of October 12, 1939W
Solar eclipse of October 12, 1939
Strömgren sphereW
Strömgren sphere