First International Polar Year Karl Weyprecht Mini Sov. Sheet MNH monet Summer afternoon

Summer afternoon

small changes to one part of the system can grow to have large effects on the system as a whole

each of the planets rotated around an axis tilted with respect to its orbital pole

Comoros Famous Firefighters Helicopter Trees Souvenir Sheet Mint NH

First International Polar Year Karl Weyprecht Mini Sov. Sheet MNH monet Summer afternoonMozambique First International Polar Year Karl Weyprecht Mini Sov. Sheet MNH The International Polar Years (IPY) are collaborative, international efforts with intensive research foci on the polar regions. Karl Weyprecht, an Austro Hungarian naval officer, motivated the endeavor in 1875, but died before it first occurred in 18821883. Fifty years later (19321933) a second IPY took place. The International Geophysical Year was inspired by the IPY and was