"Mt. Rainier has quite a few tricks up its sleeve for adding additional beauty to the Pacific Northwest, from the majestic snow-capped peaks, to the mysterious lenticular cloud displays. But another trick it pulls off during the fall and winter is to cast a big shadow on a brilliant sunrise. It only happens when the sun rises farther to the south as we head toward the winter solstice and has to be in the exact position to where Rainier blocks the first rays of morning light."
Image Credit & Copyright: Juan Carlos Casado
"Why does the shadow of this volcano look like a triangle? The Mount Teide volcano itself does not have the strictly pyramidal shape that its geometric shadow might suggest. The triangle shadow phenomena is not unique to the Mt. Teide, though, and is commonly seen from the tops of other large mountains and volcanoes. A key reason for the strange dark shape is that the observer is looking down the long corridor of a sunset (or sunrise) shadow that extends to the horizon. Even if the huge volcano was a perfect cube and the resulting shadow was a long rectangular box, that box would appear to taper off at its top as its shadow extended far into the distance, just as parallel train tracks do. The above spectacular image shows Pico Viejo crater in the foreground, located on Tenerife in the Canary Islands of Spain. The nearly full moon is seen nearby shortly after its total lunar eclipse last month."