Blocking sunlight just means
weakening it.
Left: NASA/NOAA, EPIC picture from July 5, 2016. Right: NASA/NOAA, EPIC picture from March 11, 2016.
These two pictures of two different solar eclipses were taken by the Dscovr satellite from its orbit around Lagrange Point 1 (L1). Note the relative size of the Moon on the left and the smaller shadow on the right. The shadow on the right is soft because the diameter of the Sun is 109 times bigger than Earth’s. In other words, as big as the Moon is, a great deal of sunlight simply goes around it.
Likewise, sun-blocking solar sails are too small to actually cast a shadow over the Earth. Their job is to diminish the amount of sunlight reaching the poles.
Monument Valley, Utah
Etiam porta sem malesuada magna mollis euismod. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
Denali National Park
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec sed odio dui. Nullam id dolor id nibh ultricies vehicula ut id elit.
This One Tree Somewhere
Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.