A total solar eclipse is happening in July—and it was 1st predicted in the 1800s
As I write this, the Moon is shining brightly outside my window. It's in the first quarter phase at the moment, where you can see half of its surface iluminated by the hidden Sun, the other half in shadow. Over the next week, it will wax to its full phase, then wane for the rest of the month. By the 2nd of July it will reach it will be a new moon, passing between the Earth and Sun. And on that day it will cast a shadow upon the Earth.
For about a year that date has been marked in my calendar. Since then I've been making various arrangements to be in the path of totality. Others have been making plans for years. Come July, people from all over the world will flock to Chile to stand in the shadow of the Moon for a brief moment of time.
The date and location of this South American eclipse has been known since the late 1800s. In 1887 Theodor von Oppolzer published his great which listed all solar and lunar eclipses between 1207 BC and 2161. It was a huge computational achievement.Theodor von Oppolzer Throughout much of recorded history astronomers have calculated paterns, or cycles, in solar eclipses. By 20 BC Chinese astronomers had calculated a 135-month pattern now known as the tritos cycle. Ancient Mayans noted a similar pattern in eclipses. Around the same time astronomers in Mesopotamia calculated a 223-month Saros cycle. These patterns and others allowed early astronomers to predict a solar eclipse to the day.
Eclipses were once seen as dark omens, which is perfectly understandable. It must have been terrifying to see the Sun grow suddenly dark without understanding its cause. But such powerful events also call to us. Having observed an eclipse, early astronomers strove to understand them. That curiosity and drive is part of what makes us human. It's why so many people flock to the location of an eclipse. But that's a story for another time.
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