Astronomers calculate the exact minute of the solstice using a complex mathematical model of the solar system
“It reverses like a little zigzag that it does back and forth across your horizon from solstice to solstice,” said Dr. Faherty.While its effects differ on opposite sides of the equator, the solstice takes place at the same moment world-wide.
The solstice arrives at the same moment in the Southern Hemisphere, but there it is the winter solstice. Daylight in Sydney on the solstice will last about 9 hours and 53 minutes, which is about 4 1/2 hours less than at the Southern Hemisphere’s summer solstice in December.For thousands of years, the solstice has been marked as precisely as technology allowed, first by etching rocks, then by erecting immense stone structures.
The eve of the 2019 summer solstice was marked at Stonehenge, where the celebration has been canceled this year because of Covid-19.“They built monuments aligned to them, not just to measure them but also to commemorate them, to acknowledge what seemed to be the power that they represented in driving the seasons and in defining the environment,” E.C. Krupp, director of the Griffith Observatory in Los Angeles, said of the builders of the ancient monuments. Dr.
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