Front:
Sun & Large Sunspot Group of April 7, 1947
OUR SUN IS A STAR, AND BEING RELATIVELY NEAR (93,000,000
MILES), IS THE ONLY STAR WHICH CAN BE STUDIED IN GREAT
DETAIL. ITS DIAMETER IS 864.400. MILES. ITS ROTATION PER-
IOD IS 24 DAYS, 16 HOURS. THE EFFECTIVE TEMPERATURE AT
THE CENTER OF THE DISK IS ABOUT 10,350 F.
PHOTOGRAPH FROM 60-FT. TOWER TELESCOPE
MOUNT WILSON AND PALOMAR OBSERVATORIES
PC 9
E 4724
Back:
PUBLISHED BY FRASHERS, INC. POMONA, CALIF.
A Frashers
Foto Card
Scenic Photos of the West
ADDRESS
