International Quiet Sun Year

An international cooperative effort, similar to the International Geophysical Year and extending through 1964 and 1965, to study the sun and its terrestrial and planetary effects during the minimum of the 11-year cycle of solar activity. Abbreviated IQSY. Also known as the International Year of the Quiet Sun.

Related terms:

• International Year of the Quiet Sun
• International Geophysical Year
• International Polar Year
• sun pillar
• budget year
• sun cross
• sun drawing water
• international spheroid
• sun crust
• two-year ice